Epidemiología de la faringitis estreptocócica. Período enero de 2018 - diciembre de 2021 / Epidemiology of streptococcal pharyngitis. January 2018 - December 21

La faringoamigdalitis es uno de los motivos más frecuentes de consulta en pediatría. Aproximadamente un 70-80% de las faringoamigdalitis son de etiología viral. El 20-30% restante son de origen bacteriano. El agente causal más frecuente es Streptococcus pyogenes (estreptococo ß-hemolítico del grupo A). El rol de Streptococcus dysgalactiae subsp. equisimilis, (estreptococos ß-hemolíticos grupos C y G) fue claramente establecido como agente etiológico en la faringitis bacteriana, tanto en niños como en adultos. Se realizó un análisis descriptivo y retrospectivo entre enero 2018 y diciembre de 2021. Se evaluó la prevalencia de faringitis estreptocócica, la edad, el período estacional, los agentes etiológicos y la resistencia a macrólidos durante los períodos pre-COVID-19 (2018-2019) y COVID-19 (2020-2021). Se analizaron 11 396 muestras de exudados de fauces de pacientes con sospecha de faringitis bacteriana; las mismas se procesaron mediante el uso de técnicas microbiológicas convencionales. En el período estudiado el porcentaje de positividad de los cultivos de exudados de fauces se mantuvo constante. Al comparar los períodos pre-COVID-19 (2018-2019) y COVID-19 (2020-2021) se observó una disminución en el número de aislados de S. pyogenes con un aumento de S. dysgalactiae subsp. equisimilis, mientras que la resistencia a macrólidos encontrada fue superior en S. pyogenes y para S. dysgalactiae subsp. equisimilis se mantuvo constante. Es importante realizar el cultivo para la identificación del agente etiológico y determinar la sensibilidad antibióticapara continuar con la vigilancia epidemiológica de la resistencia a los macrólidos, porque representan una opción en pacientes alérgicos a ß-lactámicos (AU)

Pharyngotonsillitis is one of the most frequent reasons for consultation in children. Approximately 70-80% of pharyngotonsillitis are of viral etiology. The remaining 20-30% are bacterial in origin. The most frequent causative agent is Streptococcus pyogenes (group A ß-hemolytic streptococcus). Streptococcus dysgalactiae subsp. equisimilis (ß-hemolytic streptococcus groups C and G) was clearly established as an etiologic agent in bacterial pharyngitis in both children and adults. A descriptive and retrospective analysis was conducted between January 2018 and December 2021. The prevalence of streptococcal pharyngitis, age, seasonal period, etiologic agents, and macrolide resistance during the pre-COVID-19 (2018-2019) and COVID-19 (2020-2021) periods were evaluated. We analyzed 11 396 specimens of swabs from patients with suspected bacterial pharyngitis. Conventional microbiological techniques were used. In the study period, the percentage of positivity of swab cultures remained constant. When comparing the preCOVID-19 (2018-2019) and COVID-19 (2020-2021) periods, a decrease in the number of S. pyogenes isolates was observed with an increase in S. dysgalactiae subsp. equisimilis, while the resistance to macrolides found was higher for S. pyogenes and remained constant for S. dysgalactiae subsp. equisimilis. The identification of the etiologic agent and determination of antibiotic sensitivity are important for epidemiological surveillance of macrolide resistance, as they are a treatment option in patients who are allergic to ß-lactams (AU)

Detección rápida de antígenos de Streptococcus pyogenes en pacientes de 0 a 14 años asistidos en dos servicios de urgencia pediátrica (14/2/2018-13/4/2018) / Rapid detection of Streptococcus pyogenes' antigens in patients of 0 to 14 years of age, assisted in two pediatric emergency wards (2/14/2018-4/13/2018) / Detecção rápida de antígenos de Streptococcus pyogenes em pacientes de 0 a 14 anos de idade assistidos por emergência pediátrica (14/2/2018-13/4/2018)

Introducción: las infecciones estreptocócicas pueden presentarse con fiebre, inflamación faringoamigdalina con o sin exudados, petequias en el paladar, adenitis cervical, exantema escarlatiniforme y / o dolor abdominal. Resulta útil en área de urgencia disponer de pruebas de detección rápida de antígenos de S. pyogenes (DRASP) de alta especificidad y sensibilidad algo menor. Objetivos: conocer la utilidad de un test de DRASP en 2 servicios de Urgencia Pediátrica, describiendo las características clínicas y epidemiológicas de los pacientes estudiados durante el período de la investigación y su correlación con el cultivo de exudado faríngeo mediante el cálculo de sensibilidad (S), especificidad (E), valor predictivo positivo (VPP) y valor predictivo negativo (VPN). Material y métodos: estudio prospectivo, observacional, transversal en dos servicios de emergencia pediátrica. Se incluyeron niños a los que se les realizó DRASP y exudado faríngeo (EF) entre el 14 de febrero y el 13 de abril de 2018. Se registró: sexo, edad, motivo de consulta, diagnóstico, tratamiento, destino, resultado del test y de cultivo faríngeo. Se calcularon S, E, VPP y VPN. Resultados: n=241 niños. Rango 8 meses - 14 años, media 6 años. Consultaron por fiebre 103 niños (42,7%); por odinofagia 48, por erupción 11 y 47 por otros síntomas. Al 95% de los niños se le otorgó el alta. DRASP negativos 87,6% (N: 211) y positivos 12,9% (N: 31). EF negativos 80,1% (n: 193) y positivos para SßHGA en 13,7% (n: 33). La sensibilidad de la prueba fue del 52% y su especificidad del 93%. El VPP 55% y el negativo 92%. El diagnóstico más frecuente fue faringitis viral 132 (54,7%). Conclusiones: el test se aplicó fundamentalmente a escolares febriles, algunos con odinofagia. Contribuye a diferenciar en forma rápida la etiología y habilita a no usar antibióticos en caso de resultado negativo. Estos resultados avalan el uso de DRASP en la urgencia pediátrica.

Introduction: streptococcal infections can show fever, pharyngotonsillar inflammation with or without swabs, palatal petechiae, cervical adenitis, scarlatiniform rash and/or abdominal pain. Rapid detection tests for S. pyogenes antigens (DRASP) with high specificity and somewhat lower sensitivity are a useful at the Emergency Ward. Objectives: know the usefulness of a DRASP test in 2 Pediatric Emergency, describe the clinical and epidemiological characteristics of the patients studied during the research period and its correlation with the culture of pharyngeal exudates by calculating sensitivity (S) , specificity (S), positive predictive value (PPV), and negative predictive value (NPV). Material and Methods: prospective, observational, cross-sectional study carried out in two pediatric emergency wards. We included children who underwent DRASP and pharyngeal swab (PS) between February 14 and April 13, 2018. The following data were recorded: sex, age, reason for consultation, diagnosis, treatment, destination, test results and throat cultures. S, S, PPV and NPV were calculated. Results: n=241 children. Range 8 months - 14 years, average 6 years. 103 children (42.7%) consulted due to fever; 48 due to sore throat, 11 due to rash and 47 due to other symptoms. 95% of children were discharged. DRASP negative 87.6% (N: 211) and positive 12.9% (N: 31). Negative EP 80.1% (n: 193) and positive for SßHGA in 13.7% (n: 33). The test sensitivity was 52% and specificity 93%. The PPV 55% and the negative 92%. The most frequent diagnosis was viral pharyngitis 132 (54.7%). Conclusions: the test was applied mainly to febrile schoolchildren, some with odynophagia. A quick etiology differentiation is helpful, since it prevents antibiotics from being used in the event of a negative result. These results support the use of DRASP in pediatric emergency wards.

Introdução: as infecções estreptocócicas manifestam-se com febre, inflamação faringotonsilar com ou sem exsudado, petéquias palatinas, adenite cervical, erupção cutânea escarlatiniforme e/ou dor abdominal. Nos serviços de emergência é útil realizar testes de detecção rápida para antígenos de S. pyogenes (DRASP) com alta especificidade e sensibilidade um pouco mais baixa Objetivos: conhecer a utilidade do teste DRASP em 2 Emergências Pediátricas, descrever as características clínicas e epidemiológicas dos pacientes estudados durante o período da pesquisa e sua correlação com a cultura de exsudatos faríngeos por meio do cálculo de sensibilidade (S) , especificidade (S), positivo valor preditivo (VPP) e valor preditivo negativo (VPN). Material e métodos: estudo prospectivo, observacional, transversal, realizado em duas unidades de emergência pediátrica. Foram incluídas crianças que realizaram DRASP e swab faríngeo (PS) entre 14 de fevereiro e 13 de abril de 2018. Foram registrados os seguintes dados: sexo, idade, motivo da consulta, diagnóstico, tratamento, destino, resultados de exames e culturas de garganta. S, S, VPP e VPN foram calculados. Resultados: n=241 crianças. Faixa 8 meses - 14 anos, média 6 anos. 103 crianças (42,7%) consultadas por febre; 48 por dor de garganta, 11 por erupção cutânea e 47 por outros sintomas. 95% das crianças receberam alta. DRASP negativo 87,6% (N: 211) e positivo 12,9% (N: 31). EP negativo 80,1% (n: 193) e positivo para SßHGA em 13,7% (n: 33). A sensibilidade do teste foi de 52% e a especificidade de 93%. O PPV 55% e o negativo 92%. O diagnóstico mais frequente foi faringite viral 132 (54,7%). Conclusões: o teste foi aplicado principalmente em escolares febris, alguns com odinofagia. A rápida diferenciação etiológica é útil, pois evita o uso de antibióticos em caso de resultado negativo. Esses resultados apoiam o uso do DRASP em enfermarias de emergência pediátrica.

Varicella gangrenosa: A rare chickenpox complication

Varicella gangrenosa is a rare but life-threatening dermatological complication of infection with varicella-zoster virus. A healthy 37-year-old male who had been diagnosed with varicella 20 days back was admitted to our hospital with complaints of fever and painful necrotic skin lesions. Physical examination revealed multiple round to oval ulcers covered with eschar predominantly over arms, lower limbs, back of trunk and flanks. Streptococcus pyogenes and Staphylococcus aureus grew in wound culture. Biopsy revealed ulceration and necrosis of epidermis, and edema, hemorrhage and granulation tissue formation involving the dermis and subcutaneous tissue. The patient was treated with acyclovir - parenteral followed by oral, antibiotics and supportive measures. The lesions healed and he was discharged after 20 days. We report this case to draw attention to the fact that varicella gangrenosum, even though a rare complication, may occur in the lesions of chicken pox and that the survival of patient depends on early diagnosis and aggressive treatment

Rare case of hereditary spherocytosis with rheumatic mitral stenosis

A rare case of hereditary spherocytosis (HS) and rheumatic mitral stenosis coexisting in a patient having severe stenosis, atrial fibrillation, and symptoms of the left ventricular dysfunction, along with hemolytic anemia attributed to HS. We present the case of a 58-year-old lady who presented to the emergency department with complaints of increasing shortness of breath for the past week. She was examined to have atrial fibrillation with a fast ventricular rate. On investigations, she was found to have severe rheumatic mitral stenosis with evidence of hemolytic anemia. Further, evaluation of the cause of her anemia revealed HS.This case highlights the importance of the evaluation of anemia in patients with valvular heart diseases. If a treatable cause is found, anemia can be treated to reduce the cardiac burden

Enfermedades invasoras por Streptococcus pyogenes en población pediátrica. Caracterización clínico-molecular 2014-2020

Introducción: Streptococcuspyogenes (EGA) es agente de enfermedad invasora (EI); su alta morbimortalidad exige vigilancia epidemiológica. Objetivo: Describir características clínicas y epidemiológicas de niños hospitalizados con EI por EGA en un centro de referencia de Uruguay del 1/1/2014 al 31/12/2020 incluyendo el estudio de los factores de virulencia encontrados en las cepas aisladas. Materiales y Métodos: Descriptivo y retrospectivo. Definición de caso: aislamiento de EGA. en sitios estériles. Variables: epidemiológicas, clínicas, laboratorio, tratamiento y evolución. Se tipificó por secuenciación del gen emm. Se obtuvieron perfiles cromosómicos por digestión del ADN con la enzima SmaI. Presencia de los genes que codifican SpeB, SpeA, SpeC y Ssa, y susceptibilidad a antimicrobianos. Resultados: Tasa de admisiones: 3,98/10.000. Se incluyeron 22 pacientes; infección osteoarticular (n = 11), infección pleuropulmonar (n = 6), absceso no cutáneo (n = 4) y aislamiento en sangre (n = 1). Media de edad: 44 meses; 8 fueron graves, siendo su media de edad menor (16 meses) Todas los casos con neumonías fueron graves y un paciente falleció. Se secuenciaron 12 cepas: 5 emm1 (4 emm 1.29 y 1 emm 1) y 1 de cada uno de los siguientes: emm 6.4, emm 81, emm12, emm28, emm 22, emm 87, emm 11. Todas eran SpeB+. Perfiles de toxinas: SpeA+SpeC-Ssa-(5), SpeA-SpeC+Ssa-(4) SpeA-SpeC-Ssa-(2) y SpeA-SpeC+Ssa+ (2). Conclusiones: Este estudio permite dar continuidad a un estudio previo. Se logró mayor tipificación de EGA. que puede contribuir a su conocimiento clínico molecular. No hubo registro de pacientes con diagnóstico de SST ni de fascitis necrosante, a diferencia de la serie anterior.

Background: Streptococcus pyogenes (GAS) is an agent of invasive disease (ID); its high morbidity and mortality requires epidemiological surveillance. Aim: To describe the clinical and epidemiological characteristics of children hospitalized with ID due to GAS in a reference center in Uruguay from January 1-2014 to December 31-2020, including a study of virulence factors. Methods: Descriptive and retrospective. Case definition: Isolation of GAS in sterile sites. Variables: epidemiological, clinical, laboratory, treatment and evolution. Strains were typified by sequencing of the emm gene. Chromosomal profiles were obtained by digestion of the DNA. with the Smal enzyme. Presence of SpeB, SpeA and SpeC genes and susceptibility to antibiotics were performed. Results: Admissions rate: 3.98/10,000. 22 patients were included; osteoarticular infection (n = 11), pleuropulmonary infection (n = 6), non-cutaneous abscess (n = 4) and blood isolation (n = 1). Mean age: 44 months; 8 cases were severe, their mean age was lower (16 months). All pneumonia cases were severe and one patient died. Twelve strains were sequenced: 5 emm1 (4 emm1.29 and 1 emm1) and 1 of each: emm6.4, emm81, emm 12, emm28, emm 22, emm 87, emm 11. All were SpeB+. Toxin profiles: SpeA+SpeC-Ssa-(5), SpeA-SpeC+Ssa-(4) SpeA-SpeC-Ssa-(2) and SpeA-SpeC+Ssa+(2). Conclusions: This study allows to give continuity to a previous study. Greater typing of GAS was achieved, which may contribute to its molecular clinical knowledge. There was no record of patients diagnosed with TSS or necrotizing fascitis, unlike the previous series.

Research progress of novel drug therapy for antibody-mediated rejection in kidney transplantation / 中华泌尿外科杂志

Antibody-mediated rejection (AMR) is the primary factor affecting the long-term prognosis of kidney transplant recipients and kidney allograft. Currently, there is no universally recognized or approved drug for the treatment of AMR. Therefore, more novel drug studies and clinical trials are urgently needed in order to change the long-term prognosis of kidney transplant recipients. Based on the core principles of prevention and treatment of AMR, this paper discusses the mechanism and efficacy of several new types of drugs of most concern in the treatment of AMR from three aspects: removing donor specific antibody, blocking antibody-mediated and complement-mediated tissue damage, and inhibiting the proliferation and activation of antibody-producing cells. These emerging drugs have shown potential in preventing and treating AMR and improving the prognosis of recipients, which is expected to change the dilemma of AMR treatment in the future and provide more effective treatment options for improving the long-term prognosis of kidney transplant recipients.

Multilocus sequence typing of Streptococcus pyogenes isolated from children in Shenzhen / 中华实用儿科临床杂志

Objective:To explore the epidemiological characteristics of Streptococcus pyogenes, namely β-hemolytic Group A Streptococcus (GAS) in children in Shenzhen. Methods:Multilocus sequence typing (MLST) data on the epidemic clonal population of GAS infection in children in Shenzhen Children′s Hospital from January 2016 to December 2018 were retrospectively analyzed.In the present study, 32 GAS strains belonging to 7 different emm types were from 32 children′s with impetigo, cellulitis, scarlet fever, sepsis, pneumonia, obstructive sleep apnea hypopnea syndrome, bronchitis, allergy with rhinitis, buttock abscess, allergic purpura or pharyngeal tonsillitis, which were isolated from 23 throat swabs, 5 sputum samples, 3 pus and 1 blood.Using polymerase chain reaction technology, 7 pairs of allelic housekeeping genes ( gki, gtr, murI, mutS, recP, xpt and yqiL) of 32 GAS isolates were analyzed, and the target gene products were subjected to sequencing.Then the obtained gene sequences of each allele were submitted to the MLST database to obtain the allele profile.Finally, the allele profiles were introduced in the MLST database again to confirm the sequence typing (ST). Results:The GAS clone groups of emm 1.00 and its subtypes, emm 4.00, emm 12.00 and its subtypes, emm 22.00, emm 28.00, emm 75.00, and emm 89.00 belonged to the sequence typing ST28, ST39, ST36, ST46, ST52, ST49, and ST921, respectively. Conclusions:From 2016 to 2018, the MLST clone populations of GAS isolates causing infections in children in Shenzhen are classified as ST28, ST39, ST36, ST46, ST52, ST49 and ST921.

In vitro antimicrobial activity of Caesalpinia coriaria (Jacq. ) Willd extracts on Streptococcus pyogenes and Candida albicans / Actividad antimicrobiana in vitro de extractos de Caesalpinia coriaria (Jacq. ) Willd sobre Streptococcus pyogenes y Candida albicans

Background: "Dividivi" Caesalpinia coriaria (Jacq.) Willd fruits are traditionally used by the Wayuú community in La Guajira (Colombia) to treat oral and skin cavity diseases caused by bacteria and fungi. Streptococcus pyogenes is a gram-positive cocci of group A (beta-hemolytic) that is the cause of pharyngeal disease, scarlet fever, cellulitis, erysipelas, or toxic shock-like syndrome. Alternatively, Candida albicans is a yeast-like fungus that is a normal flora of the digestive tract, vagina, or skin folds; it has been known to be the root cause of opportunistic diseases such as diaper rash, oral and esophagus thrush, or vulvovaginitis. Objective: This study evaluated the antimicrobial activity of methanolic and ethanolic extracts of C. coriaria (Jacq.) Willddry fruits on S. pyogenes ATCC 12384andC. albicans ATTC 14053. Method: C. coriaria extracts were obtained from the Soxhlet method using two solvents (methanol and ethanol 98%) prepared from pulverized fruits. A phytochemical test and an antimicrobial activity assay were performed using the obtained extracts and tested using S. pyogenes ATCC 12384 and C. albicans ATTC 14053 strains. Results: A phytochemical profile was performed, examining the presence of bioactive metabolites (tannins, alkaloids, glycosides, saponins, and anthraquinones) from each extract. Antimicrobial susceptibility tests showed that the ethanolic extract inhibited S. pyogenes ATCC 12384,causing inhibition halos of 14.1 ± 0.1 mm and a Minimum Inhibitory Concentration (MIC) of 172 mg/ml, and C. albicans test shows inhibition halos of 16.1 ± 0.2 mm and MIC of 212 mg/ml. Additionally, the methanolic extract inhibited S. pyogenes with inhibition halos of 15.2 ± 0.2 mm and MIC of 152 mg/ml; no inhibitory effect was observed on C. albicans.Conclusion: This study revealed that C. coriaria has an antimicrobial effect on the tested species opening the field of its possible use as a therapeutic agent

Introducción: Los frutos del "Dividivi" Caesalpinia coriaria (Jacq.) Willd son usados tradicionalmente por la comunidad indígena Wayuú en La Guajira (Colombia) para el tratamiento de enfermedades de la cavidad bucal y cutáneas ocasionadas por bacterias y hongos. Streptococcuspyogenes es un coco grampositivo del grupo A (beta-hemolítico) que es la causa de enfermedad faríngea, escarlatina, celulitis, erisipela o síndrome tipo shock tóxico. Candida albicans es un hongo levaduriforme que es flora normal del tracto digestivo, la vagina o los pliegues de la piel; se sabe que es la causa principal de enfermedades oportunistas como la dermatitis del pañal, aftas bucales y esofágicas, o vulvovaginitis. Objetivo: El objetivo de este estudio fue evaluar la actividad antimicrobiana de extractos metanólicos y etanólicos de frutos secos sobre microorganismos patógenos específicamente S. pyogenes ATCC 12384yC. albicansATTC 14053. Método: A partir de frutos polverizados de C. coriaria, usando el método Soxlet, se evaluaron dos solventes (metanol y etanol al 98%), los cuales, fueron usados para estudiar su actividad antimicrobiana evaluando su efecto en cepas de S. pyogenes ATCC 12384 y C. albicans ATTC 14053. Resultados: Mediante un perfil fitoquímico se determinó la presencia de grupos de metabolitos secundarios con compuestos bioactivos (taninos, alcaloides, glucósidos, saponinas, y antraquinonas). Las pruebas de sensibilidad antimicrobiana mostraron que el extracto etanólico tuvo un efecto inhibidor sobre S. pyogenesATCC 12384 con halos de inhibición de 14.1 ± 0.1 mm y una concentración mínima inhibitoria (CMI) de 172 mg/mL, y sobre C. albicans se presentaron halos de inhibición de 16.1 ± 0.2 mm y CMI de 212 mg/mL, mientras que el extracto metanólico tuvo un efecto inhibidor sobre S. pyogenes con halos de inhibición de 15.2 ± 0.2 mm y CMI de 152 mg/mL no se observó efecto inhibidor sobre C. albicans. Conclusión: Este estudio demostró que C. coriaria tiene efecto antimicrobiano en las especies evaluadas, abriendo un campo de investigación en la evaluación de su uso como agente terapéutico

Sensibilidad disminuida a los antibóticos Beta-Lactamicos en estreptococos Beta-Hemolíticos / Decreased sensitivity to beta-lactam antibiotics in beta-hemolytic streptococci

Últimamente, se están detectando mutaciones en las proteínas ligadoras de penicilina (PBP) de los estreptococos beta-hemolíticos que corresponden a sitios que en Streptococcus pneumoniae han determinado sensibilidad disminuida a los antibióticos beta-lactámicos. Primero, se describieron cepas con sensibilidad intermedia a penicilina en Streptococcus agalactiae (estreptococos del grupo B), luego en Streptococcus dysgalactiae subsp. equisimilis (mayormente grupos C y G) y, más recientemente, cepas con sensibilidad disminuida a aminopenicilinas y cefalosporinas de tercera generación en Streptococcus pyogenes (grupo A). El costo biológico de estas modificaciones nos permite pensar que los niveles de resistencia no han de ser tan elevados como para comprometer por ahora la efectividad clínica de los beta-lactámicos (AU)

Recently, mutations in penicillin-binding proteins (PBPs) of beta-hemolytic streptococci have been detected corresponding to sites that in Streptococcus pneumoniae have been determined to have decreased sensitivity to beta-lactam antibiotics. First, strains with intermediate sensitivity to penicillin were described in Streptococcus agalactiae (group B streptococci), subsequently in Streptococcus dysgalactiae subsp. equisimilis (mainly groups C and G) and, more recently, strains with decreased sensitivity to third-generation aminopenicillins and cephalosporins were found in Streptococcus pyogenes (group A). The biological cost of these modifications suggests that, for now, resistance levels are not high enough to compromise the clinical effectiveness of beta-lactams (AU)

Research progress on desensitization therapy for highly sensitized kidney transplant recipients / 器官移植

Human leukocyte antigen (HLA) sensitization has been previously considered as a contraindication for kidney transplantation. In the past 30 years, with the development of desensitization therapy strategies and immunosuppressants, more and more highly sensitized patients have been eligible for kidney transplantation. However, highly sensitized patients still face a high incidence of hyperacute rejection and antibody-mediated rejection following kidney transplantation, which restricts the success of kidney transplantation and long-term graft survival. At present, exploring effective desensitization regimen is a hot spot in the research of organ transplantation. In this article, the current desensitization therapy strategies, new preparations for desensitization therapy, and the benefits and risks of desensitization therapy were reviewed, and the current status and future direction of desensitization therapies were investigated, aiming to provide reference for resolving the immune barrier, improving the success rate of kidney transplantation and enhancing the quality of life of highly sensitized recipients.

Distribution of virulence genes and the molecular epidemiology of Streptococcus pyogenes clinical isolates by emm and multilocus sequence typing methods

@#Background: Streptococcus pyogenes has a variety of virulence factors and the predominant invasive strains differ according to specific emm types and geographical orientation. Although emm typing is commonly used as the gold standard method for the molecular characterisation, multilocus sequence typing (MLST) has become an important tool for comparing the genetic profiles globally. This study aimed to screen selected virulence genes from invasive and non-invasive clinical samples and to characterise the molecular epidemiology by emm typing and MLST methods. Materials and Methods: A total of 42 S. pyogenes isolates from invasive and non-invasive samples collected from two different tertiary hospitals were investigated for the distribution of virulence factors and their molecular epidemiology by emm and multilocus sequence typing methods. Detection of five virulence genes (speA, speB, speJ, ssa and sdaB) was performed using multiplex polymerase chain reaction (PCR) using the standard primers and established protocol. Phylogenetic tree branches were constructed from sequence analysis utilised by neighbour joining method generated from seven housekeeping genes using MEGA X software. Results: Multiplex PCR analysis revealed that sdaB/speF (78.6%) and speB (61.9%) were the predominant virulence genes. Regardless of the type of invasiveness, diverse distribution of emm types/subtypes was noted which comprised of 27 different emm types/subtypes. The predominant emm types/subtypes were emm63 and emm18 with each gene accounted for 11.8% whereas 12% for each gene was noted for emm28, emm97.4 and emm91. The MLST revealed that the main sequence type (ST) in invasive samples was ST402 (17.7%) while ST473 and ST318 (12% for each ST) were the major types in non-invasive samples. Out of 18 virulotypes, Virulotype A (five genes, 55.6%) and Virulotype B (two genes, 27.8%) were the major virulotypes found in this study. Phylogenetic analysis indicated the presence of seven different clusters of S. pyogenes. Interestingly, Cluster VI showed that selected emm/ST types such as emm71/ST318 (n=2), emm70.1/ST318 (n=1), emm44/ST31 (n=1) and emm18/ST442 (n=1) have clustered within a common group (Virulotype A) for both hospitals studied. Conclusion: The present study showed that group A streptococcci (GAS) are genetically diverse and possess virulence genes regardless of their invasiveness. Majority of the GAS exhibited no restricted pattern of virulotypes except for a few distinct clusters. Therefore, it can be concluded that virulotyping is partially useful for characterising a heterogeneous population of GAS in hospitals.

In Vitro Assessment of Biofilm Formation by Streptococcus pyogenes Isolates From Invasive and Non-invasive Samples With Diverse emm Type Profiles

@#Introduction: Biofilm is one of the important virulence factors that is responsible for the severity and progression of the Streptococcus pyogenes diseases. M-protein is involved in the irreversible attachment of S. pyogenes to surfaces during biofilm development. This study aims to determine the propensity of S. pyogenes to form biofilms and the molecular epidemiology of S. pyogenes isolates by emm typing. Methods: We screened 45 S. pyogenes isolates for the biofilm formation by Congo red agar (CRA) and quantified the biofilms by crystal violet microtiter-plate methods (CVMtP). The emm typing of all isolates was performed by conventional PCR with established primers according to the CDC protocol. Results: Majorities of S. pyogenes were isolated from non-invasive, 27 (60.0%) than invasive sources, 18 (40.0%). Regardless of invasiveness, 40 (88.9%) S. pyogenes isolates formed black colonies on CRA, while 43 (95.6%) of the isolates demonstrated various degrees of biofilm formation by CVMtP method. A total of 30 different emm types and subtypes were identified. No new emm types/subtypes were detected. The predominant emm types/subtypes were emm1, emm63, emm18.21, emm91, and emm97.4 which each gene accounted for 7.0%. All emm types/subtypes of S. pyogenes produced biofilms by CVMtP method except emm17.2 and emm57 which were isolated from non-invasive sources. Conclusions: Biofilm-producing S. pyogenes strains of various sources are genetically diverse and biofilm phenotypes are inherent to individual characteristic rather than specific emm type. Nonetheless, higher propensity of GAS to form biofilms warrants better management strategies to avoid treatment failures in the future.

Poliartritis séptica y fascitis necrotizante en un paciente inmunocompetente. Reporte de caso / Septic polyarthritis and necrotizing fascitis in an immunocompetent patient. Case report

La presentación de poliartritis séptica en un paciente inmunocompetente es infrecuente, aún más lo es la presentación de la mencionada junto con fascitis necrotizante en el contexto de infección por Streptococcus Pyogenes (SP). Se presenta el caso de un paciente masculino de 54 años, recluido, sin antecedentes médicos relevantes, inmunocompetente, quien debuta con un cuadro clínico de poliartritis séptica en rodilla bilateral y tobillo izquierdo. Recibe manejo con múltiples lavados y desbridamientos quirúrgicos, desarrolla fascitis necrotizante de la cara posterior de la pierna izquierda, recibe a su vez manejo quirúrgico para dicha condición (incluyendo aplicación de terapia de vacío), al igual que antibioticoterapia enfocada al manejo del germen aislado (Penicilina + vancomicina). Sin embargo, tras un mes de manejo conjunto con servicios de Cirugía Plástica, Dermatología, Ortopedia, así como vigilancia en Unidad de Cuidados Intensivos, termina con un desenlace fatal tras presentar falla multiorgánica. La infección por el SP puede resultar en una elevada morbilidad para él paciente e incluso un desenlace mortal secundario a un compromiso sistémico de muy difícil manejo. El diagnóstico oportuno, así como un tratamiento médico y quirúrgico agresivo pueden no ser suficientes para el control de la infección, incluso en pacientes sin compromiso inmunológico previo. Asimismo, un enfoque multidisciplinario debe corresponder al estándar de manejo con el fin de controlar aquellas condiciones predisponentes de infección. Este es el primer caso reportado en la literatura nacional en relación con estas dos fatales condiciones. Finalmente se pretende resaltar que a pesar de que esta infección suele comprometer infantes y pacientes inmunocomprometidos, no se debe obviar su diagnóstico en pacientes previamente sanos, especialmente en casos de infecciones de rápida diseminación y poca respuesta al manejo adecuado.

Septic polyarthritis in an immunocompetent patient is highly rare, even more when it coexists with necrotizing fasciitis caused by Streptococcus Pyogenes (SP). A 54 year old, immunocompetent male patient is presented herein. The patient had no relevant previous illness, before the installation of a septic arthritis of both knees and he's left ankle. He receives treatment with sequential surgical debridement, then develops necrotizing fasciitis of the posterior aspect of the left leg requiring adequate treatment for such condition (including Vacuum Assisted Closure), as well as antibiotic therapy for the specific infecting microorganism (Penicillin + Vancomycin). Nonetheless, after a month of surgical management between Plastic Surgery, Dermatology, Orthopaedics as well as surveillance in the Intensive Care Unit, the patient dies after multi organic failure. Infection caused by SP might entail high morbidity for a patient and even end with death of the aforementioned caused by a hard to manage systemic organic failure. The adequate diagnosis, as well as aggressive medical and surgical management could not be enough for controlling the infection, even in patients without previous immunological compromise. At the same time, a multidisciplinary approach must be the standard of treatment, aiming to control predisposing infectious conditions. This is the first case reported in national literature related to these two fatal conditions. Finally, one of the purposes of this report is to highlight that despite reports of this microorganism infecting infants and immunocompromised patients, it must not be obviated in healthy patients, especially in cases of rapidly spreading infection and scarce response to adequate management.

Evaluation of a rapid diagnostic test for the detection of Streptococcus pyogenes in invasive infections / Evaluación de una prueba diagnóstica rápida para la detección de Streptococcus pyogenes en infecciones invasivas

Abstract Invasive Streptococcus pyogenes diseases represent the most severe form of infection produced by this microorganism. Early diagnosis and treatment are important, due to its potential severity. Etiological confirmation of invasive infection is performed by culture, which takes between 18 and 48 h. We tested a rapid immunochromatographic assay directly from clinical samples from normally sterile sites and positive blood culture bottles when pos-itive cocci chains were observed by Gram staining. Eighty samples were analyzed. The rapid test was positive in 35 samples: in 34 of them S. pyogenes was confirmed by culture. The immunochromatographic method showed 97.1% sensitivity and 97.8% specificity. The strept A® immunochromatographic rapid test allows to obtain reliable results in less than 10min and is accessible to any microbiology laboratory. This study demonstrates the potential use of a rapid immunochromatographic method directly from clinical samples and positive blood cultures.

Resumen La enfermedad invasiva por Streptococcus pyogenes representa la forma más grave de infección producida por este microorganismo y requiere un rápido diagnóstico, a fin de instaurar un tratamiento adecuado. La confirmación etiológica de esta infección se realiza por cultivo, lo que puede llevar entre 18 y 48 h. En este estudio ensayamos una prueba inmunocromatográfica rápida directamente de muestras clínicas de sitios normalmente estériles y de botellas de hemocultivos positivos cuando la coloración de Gram evidenció cocos gram positivos en cadena. Se analizaron 80 muestras. La prueba rápida fue positiva en 35 muestras: en 34 de ellas se confirmó la presencia de S. pyogenes por cultivo. La sensibilidad y la especificidad de la prueba fueron del 97,1 y el 97,8%, respectivamente. La prueba inmunocromatográfica rápida monteBIO Strep A® permite obtener resultados confiables en menos de 10 min y es accesible para cualquier laboratorio de microbiología. Este estudio demuestra la utilidad de dicha prueba para ser practicada directamente en muestras clínicas y botellas de hemocultivos positivos.

Meningitis por Streptococcus pyogenes: informe de un caso pediátrico / Streptococcus pyogenes meningitis: a pediatric case report

La meningitis por estreptococo beta hemolítico, en particular del grupo A, o Streptococcus pyogenes, es una rara localización del grupo de infecciones invasivas por este microorganismo. Se presenta con frecuencia en niños sanos, sin factores predisponentes. Representa el 0,2-1 % de todas las meningitis. Generalmente, se instala por diseminación de la infección de un foco cercano. El agregado de clindamicina mejora la eficacia del tratamiento por su acción de inhibición de la síntesis proteica, que incluye la producción de toxina. La clindamicina incrementa la acción bactericida al actuar sobre el ribosoma bacteriano. La patogenia de la enfermedad no es clara; se propuso la asociación con exotoxinas. La coinfección con el virus influenza favorecería infecciones invasivas. Se presenta el caso de un niño de 6 años de edad previamente sano con diagnóstico de meningitis por estreptococo beta hemolítico del grupo A, localización poco frecuente en niños.

Beta hemolytic particularly of group A Streptococcus meningitis, is a rare site of the group of invasive infections caused by this microorganism. It occurs frequently in healthy children, without predisposing factors. It represents 0.2-1 % of all meningitis. It is usually installed by dissemination from a nearby focus. The addition of clindamycin improves the treatment efficacy by inhibition of bacterial protein synthesis, including toxin production. The pathogenesis of the disease is not clear, the association with exotoxins was proposed. Co-infection with the influenza virus would favor invasive infections. We present this case of a previously healthy 6-year-old boy with a diagnosis of beta hemolytic Streptococcus meningitis group A, a rare location in children.

Orofacial space infections, etiology, microbiological susceptibility and surgical management / Infecciones del espacio orofacial, etiología, susceptibilidad microbiológica y manejo quirúrgico

Orofacial infections are considered as one of most common infections and need rapid and adequate treatment as they affect a very delicate region and are associated with serious life-threatening complications. Orofacial infections can be either odontogenic that is with an origin in teeth and associated structures or non-odontogenic, not associated with teeth, can affect facial spaces and spread from one space to another, so a good knowledge about diagnosis and treating these infections is of utmost importance, and can include both non-surgical and surgical treatment. The aim of our study was to determine the most common cause of orofacial infections, the most common bacterial microorganisms and their antibiotic susceptibility. Materials and Methods: A descriptive study was undertaken in the Department of Oral and Maxillofacial Surgery, Al-Shaheed Ghazi Al-Hariry Hospital, Baghdad, Iraq from 1st January to 30th September 2015. This study included 45 patients with different forms of orofacial infections; data regarding age, gender, underlying cause, facial space involvement, presenting signs were collected through history, clinical examination and radiographs, incision and drainage with swab sample for culture and sensitivity test was performed. Results: Patients with orofacial infections showed a female to male ratio of 1.25:1. The mean age was 32.8 years. Most of the patients were in their 4th decade of life (27%). Most infections were odontogenic in origin (62%), the most common facial space involved was submandibular (65%), the most common isolated microorganism was Streptococcus pyogenes (59%), and most patients were treated using an extra-oral surgical approach (78%). Antibiotics to which bacterial isolated showed the most sensitivity were netilmicin, cefoperazone and rifampicin (91%). Pain and limitation of mouth opening gradually decreased in most of patients during the two weeks follow up period. Conclusion: Orofacial infections were more common in females, in the third and fourth decade of life, were odontogenic in origin, were mostly caused by Streptococcus pyogenes, and most isolates were susceptible to netilmicin, cefoperazone and rifampicin. Pain and trismus decreased over two weeks post-treatment.

Las infecciones orofaciales se consideran una de las infecciones más comunes y necesitan un tratamiento rápido y adecuado, ya que afectan una región muy delicada y se asocian con complicaciones graves que amenazan la vida. Las infecciones orofaciales pueden ser odontogénicas que se originan en los dientes y las estructuras asociadas, o no odontogénicas, no asociadas con los dientes, pueden afectar los espacios faciales y propagarse de un espacio a otro, por lo que un buen conocimiento sobre el diagnóstico y el tratamiento de estas infecciones es de suma importancia, y puede incluir tratamiento no quirúrgico y quirúrgico. El objetivo de nuestro estudio fue determinar la causa más común de infecciones orofaciales, los microorganismos bacterianos más comunes y su susceptibilidad a los antibióticos. Material y Métodos: se realizó un estudio descriptivo en el Departamento de Cirugía Oral y Maxilofacial, Hospital Al-Shaheed Ghazi Al-Hariry, Bagdad, Iraq del 1 de enero al 30 de septiembre de 2015. Este estudio incluyó a 45 pacientes con diferentes formas de infecciones orofaciales; Se recopilaron datos sobre edad, sexo, causa subyacente, afectación del espacio facial, signos de presentación a través de la historia, examen clínico y radiografías, incisión y drenaje con muestra de hisopo para cultivo y prueba de sensibilidad. Resultado: Los pacientes con infecciones orofaciales mostraron una relación mujer/hombre de 1.25: 1. La edad media fue de 32,8 años. La mayoría de los pacientes estaban en su cuarta década de vida (27%). La mayoría de las infecciones fueron de origen odontogénico (62%), el espacio facial más común involucrado fue submandibular (65%), el microorganismo aislado más común fue Streptococcus pyogenes (59%), y la mayoría de los pacientes fueron tratados con un abordaje quirúrgico extraoral (78%). Los antibióticos a los que las bacterias aisladas mostraron mayor sensibilidad fueron netilmicina, cefoperazona y rifampicina (91%). El dolor y la limitación de la apertura de la boca disminuyeron gradualmente en la mayoría de los pacientes durante el período de seguimiento de dos semanas. Conclusión:Las infecciones orofaciales fueron más comunes en las mujeres, en la tercera y cuarta década de la vida, fueron de origen odontogénico, fueron causadas principalmente por Streptococcus pyogenes y la mayoría de los aislamientos fueron susceptibles a la netilmicina, cefoperazona y rifampicina. El dolor y el trismo disminuyeron durante las dos semanas posteriores al tratamiento.

Bacteriemia con afectación inflamatoria pélvica y miositis secundaria a histeroscopia diagnóstica. Reporte de un caso / Bacteremia with pelvic inflamatory involvement and secondary myositis due to diagnostic hysteroscopy. A case report

Resumen ANTECEDENTES: Las complicaciones infecciosas secundarias a la histeroscopia diagnóstica ambulatoria son bajas (0.6%). CASO CLÍNICO: Paciente de 46 años que a los 6 días posthisteroscopia diagnóstica ambulatoria por pólipos endometriales ingresó al servicio de Ginecología debido a un cuadro de piomiositis del músculo piriforme izquierdo, secundario a bacteriemia por Streptococcus pyogenes luego de un procedimiento ginecológico. Se trató con una dosis subcutánea de 40 mg de enoxaparina al día, y 2 g de ceftriaxona intravenosa cada 24 h, 240 mg de gentamicina intravenosa una vez al día. En las siguientes 48 horas se retiró la gentamicina y se prescribió 1 g de amoxicilina cada 8 h, por vía oral más 300 mg de clindamicina cada 8 h, también por vía oral que la paciente continuó durante 7 días más. En la resonancia magnética de control tomada a los 10 días quedó de manifiesto la tromboflebitis séptica en la vena iliaca interna izquierda y la persistencia del cuadro de piomiositis, con colección pélvica intra y extramuscular. Se decidió reingresarla para tratarla con el siguiente esquema: 1 g de amoxicilina por vía intravenosa cada 8 horas y 900 mg de clindamicina con igual pauta; se suspendió a las 24 h enseguida de la valoración por el infectólogo. Se indicó nuevo tratamiento antitrombótico con 0.5 mL de fraxiparina forte cada 24 horas, por vía subcutánea. El eco-Doppler descartó la trombosis venosa profunda; los hemocultivos que resultaron negativos. La paciente fue dada de alta con prescripción de fraxiparina Forte a dosis de 0.5 mL cada 24 horas durante 6 semanas; la evolución clínica fue favorable. La resonancia magnética de control a los 30 días reportó la desaparición completa del proceso inflamatorio. Luego de un año, la paciente permanece asintomática y continúa en seguimiento médico anual. CONCLUSIONES: La histeroscopia diagnóstica ambulatoria es una técnica eficaz y segura aunque excepcionalmente pueden sobrevenir complicaciones infecciosas derivadas de la técnica. Esto se previene con profilaxis antibiótica. La valoración previa a la histeroscopia es indispensable para advertir factores de riesgo que puedan controlarse o contraindiquen la realización del procedimiento.

Abstract BACKGROUND: Infectious complications due to diagnostic hysteroscopy are uncommon, being only 0.6% of all complications. CLINICAL CASE: A 46-year-old patient who, 6 days after performing an outpatient diagnostic hysteroscopy due to endometrial polyps, was admitted to the Gynecology Department, due to pyomyositis of the left piriformis muscle secondary to Streptococcus pyogenes bacteremia after gynecological procedure. Antithrombotic treatment was initiated with Enoxaparin 40 mg, 1/24h subcutaneously and antibiotic therapy with Ceftriaxone 2g/24h intravenously (iv) and Gentamicin 240 mg/24h iv, which 48 hours later were changed to Amoxicillin 1g/8h orally (VO) and Clindamycin 300 mg/8 hours orally for another 7 days. In the 10-day control magnetic resonance imaging (MRI), septic thrombophlebitis was seen in the left internal iliac vein as well as persistence of the pyomyositis condition, with intra and extramuscular pelvic collections. Therefore, a new admission was decided to start antibiotic therapy again with Amoxicillin 1g/8h IV and Clindamycin 900 mg/8h IV, which was suspended 24 hours after assessment by the Infectious Diseases Unit; and new antithrombotic treatment with Fraxiparin Forte 0.5 mL/24h subcutaneous, by consensus with the Vascular Surgery Service. ECO-DOPPLER was performed, which ruled out Deep Venous Thrombosis (DVT); and negative blood cultures. The patient was discharged with Fraxiparina Forte 0.5 mL/24h for 6 weeks presenting good clinical evolution. A new MRI control was scheduled for the following month, finding a complete resolution of the inflammatory process. Currently, one year later, the patient is asymptomatic and continues in annual follow-up in our consultations. CONCLUSIONS: Outpatient diagnostic hysteroscopy is an effective and safe technique. Infectious complications derived from the technique are infrequent, which is why it is not necessary to perform an antibiotic prophylaxis in patients who are going to undergo this test

Síndrome de choque tóxico por Streptococcus pyogenes en un hospital de la Ciudad de México / Toxic shock syndrome caused by Streptococcus in a hospital from the Mexico City / Síndrome de choque tóxico por Streptococcus pyogenes em um hospital da Cidade do México

Resumen: El síndrome de choque tóxico por Streptococcus se describió por primera vez en 1978 por Todd y su equipo. Éste incluye datos de hipotensión, disoxia celular, aislamiento de Streptococcus pyogenes, así como la inclusión de dos o más de los siguientes criterios: síndrome de dificultad respiratoria aguda, insuficiencia renal, anormalidad hepática, coagulopatía y erupción cutánea con descamación. Es una enfermedad relativamente rara entre niños y adultos; representa una alta mortalidad, la cual oscila de 23 al 70%. En más de la mitad de los casos, se desconoce la causa de entrada de este patógeno al torrente sanguíneo, aunque los pacientes con alcoholismo, en los extremos de la vida, con comorbilidades (como enfermedad renal crónica, insuficiencia hepática y leucemias) y que hayan sido sometidos a esplenectomía son más susceptibles al contagio y a infecciones severas. En los pacientes que desarrollan infecciones de tejidos blandos profundos, como fascitis necrosante o infección intrauterina, el dolor severo es el síntoma inicial más frecuente.

Abstract: Streptococcal toxic shock syndrome was first described by Todd and collaborators in 1978, this syndrome includes hypotension, traces of cellular dysoxia, isolation Streptococcus pyogenes; as well as two or more of the following criteria: acute respiratory distress syndrome, renal failure, liver abnormality, coagulopathy, skin rash with necrosis flaking of soft tissues. It is a relatively rare disease among children and adults, representing a high mortality ranging from 23 to 70%. In more than half of the cases the cause of entry of this pathogen into the bloodstream is unknown, although patients with alcoholism, on the edge of death, with splenectomy, with comorbidities (chronic kidney disease, liver failure, leukemia) are more susceptible to infection, to acquire severe infections and shock. Cutaneous infections usually are followed by minor skin irritations (insect bites), 20% of the cases experience a flu-like syndrome (fever, chills, myalgia and diarrhea). In patients who develop deep soft tissue infections such as necrotizing fasciitis or intrauterine infection, the severe pain is the most common initial symptom of streptococcal TSS.

Resumo: A síndrome do choque tóxico estreptocócico foi descrita pela primeira vez por Todd et al em 1978, incluindo dados sobre hipotensão, disxia celular, isolamento de Streptococcus pyogenes, bem como 2 ou mais dos seguintes critérios: síndrome do desconforto respiratório agudo, insuficiência renal, anormalidade hepática, coagulopatia, erupção cutânea com descamação. É uma doença relativamente rara em crianças e adultos, representa uma alta mortalidade que varia de 23 a 70%. Em mais da metade dos casos, a causa desse patógeno na corrente sanguínea é desconhecida, embora pacientes com alcoolismo, extremos da vida, com esplenectomia e comorbidades (como doença renal crônica, insuficiência hepática, leucemia) sejam mais suscetíveis à infecção e infecções graves. Em pacientes que desenvolvem infecções profundas dos tecidos moles, como fasceíte necrozante ou infecção intra-uterina, a dor intensa é o sintoma inicial mais frequente.

Piomiositis por Streptococcus pyogenes en un paciente con malformación venolinfática. A propósito de un caso en pediatría / Pyomyositis due to Streptococcus pyogenes in a patient with venolymphatic malformation. Report of one pediatric case

Las infecciones por Streptococcus pyogenes son frecuentes en la población pediátrica en forma de faringoamigdalitis o cuadros cutáneos. Con menor frecuencia, se presenta con formas invasivas, tales como piomiositis o fascitis necrotizante. La mortalidad en niños reportada en estas últimas es de un 7,69 %. Se presenta a una paciente de 11 años con malformación venolinfática subescapular que consultó por síndrome febril asociado a dolor y aumento agudo del tamaño de la lesión. Durante la internación, se arribó al diagnóstico de piomiositis por Streptococcus pyogenes

Streptococcus pyogenes infections are common in the pediatric population in the form of tonsillopharyngitis or cutaneous disease. Less frequently, it presents with invasive forms such as pyomyositis or necrotizing fasciitis. Mortality in children is of 7 %. We present an 11-year-old patient with a subscapular venolymphatic malformation who consulted for febrile syndrome associated with pain and an acute increase in the size of the lesion. During the hospitalization, diagnosis of pyomyositis due to Streptococcus pyogenes was reached.

Infección necrotizante de tejidos blandos: experiencia durante 15 años en un hospital pediátrico / Necrotizing soft tissue infections: experience over 15 years in a pediatric hospital

INTRODUCCIÓN: La Infección Necrotizante de tejidos blandos (INTB) tiene una elevada morbimortalidad. El objetivo de este trabajo es describir del manejo perioperatorio de menores de 15 años que cursaron con INTB durante 15 años en un Hospital pediátrico. MATERIAL Y MÉTODOS: serie de pacientes identificados INTB entre 2000 y 2015 en el Hospital Roberto del Río. Se describen variables demográficas, clínicas, vacuna, tratamiento, cirugías, complicaciones, microorganismos, seguimiento, y fallecimientos. RESULTADOS: 22 pacientes, con mediana de 2 años y 9 meses de edad. 50% estaban cursando con una varicela. Dos fallecieron. Ninguno era previamente vacunado contra el virus varicela zoster. La localización fue tronco (14), extremidades (7), cuello (1). Los pacientes conscientes presentaron hiperestesia cutánea. Se realizó aseo quirúrgico con una mediana de 6,8 horas desde el inicio de la hiperestesia y 2 horas desde la sospecha diagnóstica. Los microorganismos fueron: S. pyogenes (38%) y E. coli (31%). Los antibióticos más frecuentes fueron penicilina más clindamicina. La herida se manejó con cierre primario, injertos y/o colgajos. Cinco evolucionaron con secuelas que necesitaron tratamiento. CONCLUSIÓN: Se identificó que la INTB puede presentarse con varicela. Debe sospecharse en lesiones cutáneas e hiperestesia desproporcionada. Resección amplia y precoz son fundamentales para el tratamiento.

INTRODUCTION: Necrotizing soft tissue infection (NSTI) has a high morbidity and mortality. The objective of this study is to describe the perioperative management of children under 15 years of age who have had this condition for 15 years in a pediatric hospital. MATERIAL AND METHODS: cases series of patients identified by Pathological Anatomy with NSTI during 2000 and 2015 at the Dr. Roberto del Río Hospital. Demographic variables, treatment, antecedents of vaccination, surgeries, complications, microorganisms, follow-up, and deaths are described. RESULTS: 22 patients were identified, with a median of 2 years 9 months of age (interquartile range: 13 months to 5 years y 10 months). 50% of the cases were associated to chickenpox. Two died. No patient was previously vaccinated against varicella zoster virus. The location was trunk (14), extremities (7) and neck (1). All conscious patients presented cutaneous hyperesthesia. Surgical debridement was performed with a median of 6.8 hours from the onset of hyperesthesia and 2 hours from diagnostic suspicion. The most frequent microorganisms were: Streptococcus pyogenes (38%) and Escherichia coli (31%). The most frequent antibiotics used were penicillin plus clindamycin. The wound was handled with primary closure, grafts and / or flaps. Five patients evolved with sequelae that needed treatment. CONCLUSION: It was identified that STNI in children is associated with chickenpox. It should be suspected in cutaneous lesions and disproportionate hyperesthesia. Aggressive resection is essential for treatment