Study of the inflammatory activating process in the early stage of Fusobacterium nucleatum infected PDLSCs / 国际口腔科学杂志·英文版

Fusobacterium nucleatum (F. nucleatum) is an early pathogenic colonizer in periodontitis, but the host response to infection with this pathogen remains unclear. In this study, we built an F. nucleatum infectious model with human periodontal ligament stem cells (PDLSCs) and showed that F. nucleatum could inhibit proliferation, and facilitate apoptosis, ferroptosis, and inflammatory cytokine production in a dose-dependent manner. The F. nucleatum adhesin FadA acted as a proinflammatory virulence factor and increased the expression of interleukin(IL)-1β, IL-6 and IL-8. Further study showed that FadA could bind with PEBP1 to activate the Raf1-MAPK and IKK-NF-κB signaling pathways. Time-course RNA-sequencing analyses showed the cascade of gene activation process in PDLSCs with increasing durations of F. nucleatum infection. NFκB1 and NFκB2 upregulated after 3 h of F. nucleatum-infection, and the inflammatory-related genes in the NF-κB signaling pathway were serially elevated with time. Using computational drug repositioning analysis, we predicted and validated that two potential drugs (piperlongumine and fisetin) could attenuate the negative effects of F. nucleatum-infection. Collectively, this study unveils the potential pathogenic mechanisms of F. nucleatum and the host inflammatory response at the early stage of F. nucleatum infection.

Bacteriology of peritonsillar abscess: the changing trend and predisposing factors / Bacteriologia do abscesso peritonsilar: tendência de mudança e fatores predisponentes

Abstract Introduction: Peritonsillar abscess is the most common deep neck infection. The infectious microorganism may be different according to clinical factors. Objective: To identify the major causative pathogen of peritonsillar abscess and investigate the relationship between the causative pathogen, host clinical factors, and hospitalization duration. Methods: This retrospective study included 415 hospitalized patients diagnosed with peritonsillar abscess who were admitted to a tertiary medical center from June 1990 to June 2013. We collected data by chart review and analyzed variables such as demographic characteristics, underlying systemic disease, smoking, alcoholism, betel nut chewing, bacteriology, and hospitalization duration. Results: A total of 168 patients had positive results for pathogen isolation. Streptococcus viridans (28.57%) and Klebsiella pneumoniae (23.21%) were the most common microorganisms identified through pus culturing. The isolation rate of anaerobes increased to 49.35% in the recent 6 years (p = 0.048). Common anaerobes were Prevotella and Fusobacterium spp. The identification of K. pneumoniae increased among elderly patients (age > 65 years) with an odds ratio (OR) of 2.76 (p = 0.03), and decreased in the hot season (mean temperature > 26 °C) (OR = 0.49, p = 0.04). No specific microorganism was associated with prolonged hospital stay. Conclusion: The most common pathogen identified through pus culturing was S. viridans, followed by K. pneumoniae. The identification of anaerobes was shown to increase in recent years. The antibiotics initially selected should be effective against both aerobes and anaerobes. Bacterial identification may be associated with host clinical factors and environmental factors.

Resumo Introdução: O Abscesso Peritonsilar é a infecção cervical profunda mais comum. O microrganismo infeccioso pode ser diferente de acordo com os fatores clínicos. Objetivo: Identificar o principal agente causador do abscesso peritonsilar e investigar a relação entre o patógeno causador, os fatores clínicos do hospedeiro e a duração da hospitalização. Método: Este estudo retrospectivo incluiu 415 pacientes hospitalizados diagnosticados com abscesso peritonsilar que foram internados em um centro médico terciário de junho de 1990 a junho de 2013. Coletamos dados através da análise dos arquivos médicos dos pacientes e analisamos variáveis como características demográficas, doença sistêmica subjacente, tabagismo, alcoolismo, hábito de mascar noz de betel, bacteriologia e duração da hospitalização. Resultados: Um total de 168 pacientes apresentaram resultados positivos para isolamento de patógenos. Streptococcus viridans (28,57%) e Klebsiella pneumoniae (23,21%) foram os microrganismos mais comuns identificados pela cultura da secreção. A taxa de isolamento de anaeróbios aumentou para 49,35% nos últimos 6 anos (p = 0,048). Os anaeróbios comuns foram Prevotella e Fusobacterium spp. A identificação de K. pneumoniae aumentou em pacientes idosos (idade > 65 anos) com razão de chances (Odds Ratio - OR) de 2,76 (p = 0,03) e diminuiu na estação do calor (temperatura média > 26 °C) (OR = 0,49, p = 0,04). Nenhum microrganismo específico foi associado à hospitalização prolongada. Conclusão: O patógeno mais comumente identificado através da cultura de secreção foi S. viridans, seguido por K. pneumoniae. A identificação de anaeróbios mostrou ter aumentado nos últimos anos. Os antibióticos selecionados inicialmente devem ser efetivos contra aeróbios e anaeróbios. A identificação bacteriana pode estar associada a fatores clínicos e fatores ambientais do hospedeiro.

Evaluation of chemokines and receptors in gnotobiotic root canal infection by F. nucleatum and E. faecalis

Abstract The present study aims to evaluate the longitudinal effects of induced experimental infections in gnotoxenic animals on the expression of inflammatory chemokines and their receptors in periradicular tissues. The null hypothesis tested was that Enterococcus faecalis and Fusobacterium nucleatum had no effect on CCR5, CCL5, CXCL10, CCL2/MCP-1, CXCR2 and CCR1 expression. Two groups of five animals (n = 5) aged between 8 and 12 weeks were used in this study. The animals were anaesthetized, and coronary access was performed in the first molar on the right and left sides. Microorganisms were inoculated into the left molar, and the right molar was sealed without contamination to function as a control. Animals were sacrificed 7 and 14 days after infection, and periapical tissues were collected. The cytokine mRNA expression levels were assessed using real-time PCR. The chemokine mRNA expression levels demonstrated that the experimental infection was capable of inducing increased chemokine expression on day 7 compared to that on day 14, except for CCR5 and CCL5, which showed no changes. The gnotoxenic animal model proved to be effective and allowed evaluation of the immune response against a known infection. Additionally, this study demonstrates that gene expression of chemokines and their receptors against the experimental infection preferentially prevailed during the initial phase of induction of the periradicular alteration (i.e., on day 7 post-infection).

Identificación de microorganismos por reacción en cadena de la polimerasa en necrosis pulpar y periodontitis apical / Identification of microorganisms by polymerase chain reaction in pulp necrosis and apical periodontitis

Objetivos: identificar, mediante la técnica de reacción en cadena de la polimerasa, diez especies bacterianas procedentes de conductos radiculares necróticos, así como analizar su asociación con signos y síntomas de la periodontitis apical (dolor, exudado y movilidad), dentro de un área geográfica específica, Santiago de Compostela (noroeste de España). Métodos: se realizó un estudio descriptivo, en un plazo de recogida de muestras de un año. Se extrajeron 43 muestras de los conductos radiculares necróticos, a razón de una muestra por pacientes, quienes fueron examinados previamente para determinar la presencia de periodontitis apical radiográfica, de la cual fueron descritos sus signos y síntomas. Se utilizaron puntas de papel absorbentes estériles y se procedió a extraer de dichas muestras el ADN por medio de la técnica del fenol-cloroformo. El producto se amplificó por medio de la reacción en cadena de la polimerasa, usando cebadores específicos para diez microorganismos. El resultado se visualizó por medio de electroforesis, utilizando un transiluminador UV. Los resultados se analizaron estadísticamente, para así establecer qué microorganismos estaban presentes de forma individual y cuáles se presentaron formando asociaciones como el llamado red complex, en relación con los signos y síntomas presentes en la periodontitis apical. Resultados: Fusobacterium nucleatum fue el microorganismo con presencia de forma individual más frecuente (83,72 por ciento de las muestras). En cuanto al estudio de la asociación de los microorganismos con los signos y síntomas, Porphyromonas endodontalis presentó una asociación significativa con respecto al exudado (p< 0,05) y movilidad (p< 0,05). En cambio, Enterococcus spp. y Treponema denticola (p< 0,01) presentaron ambos una asociación significativa con respecto al dolor. En cuanto a la incidencia del red complex fue de 6 casos en total. Conclusiones: Fusobacterium nucleatum y Streptococcus spp. son los microorganismos identificados con mayor porcentaje en comparación a los restantes estudiados. Porphyromonas endodontalis es el microorganismo con mayor asociación estadística con respecto a los signos y síntomas de la periodontitis apical(AU)

Objectives: identify by polymerase chain reaction technique ten bacterial species obtained from necrotic root canals, and analyze their association with signs and symptoms of apical periodontitis (pain, exudate and mobility) in a specific geographic area: Santiago de Compostela (northwestern Spain). Methods: a descriptive study was conducted based on a one-year sample collection period. Forty-three samples were taken from necrotic root canals, at a rate of one sample per patient, who had been previously examined for radiographic apical periodontitis, of which the signs and symptoms were described. Sterile absorbent paper points were used to extract the DNA samples, applying the phenol-chloroform technique. The product was amplified by polymerase chain reaction, using specific primers for ten microorganisms. The result was visualized by electrophoresis using a UV transilluminator. Outcomes were analyzed statistically to determine which microorganisms were present individually and which formed associations such as the so-called red complex, according to the signs and symptoms present in the apical periodontitis. Results: Fusobacterium nucleatum was the most common individual microorganism (83.72 percent of the samples). As to the association of microorganisms with signs and symptoms, Porphyromonas endodontalis was found to be significantly associated with exudate (p< 0.05) and mobility (p< 0.05), while both Enterococcus spp. and Treponema denticola (p< 0.01) had a significant association with pain. Incidence of the red complex was 6 cases in all. Conclusions: Fusobacterium nucleatum and Streptococcus spp. were the microorganisms identified as displaying the highest percentages. Porphyromonas endodontalis showed the greatest statistical association with signs and symptoms of apical periodontitis(AU)

High occurrence of Fusobacterium nucleatum and Clostridium difficile in the intestinal microbiota of colorectal carcinoma patients

Abstract Colorectal carcinoma is considered the fourth leading cause of cancer deaths worldwide. Several microorganisms have been associated with carcinogenesis, including Enterococcus spp., Helicobacter pylori, enterotoxigenic Bacteroides fragilis, pathogenic E. coli strains and oral Fusobacterium. Here we qualitatively and quantitatively evaluated the presence of oral and intestinal microorganisms in the fecal microbiota of colorectal cancer patients and healthy controls. Seventeen patients (between 49 and 70 years-old) visiting the Cancer Institute of the Sao Paulo State were selected, 7 of whom were diagnosed with colorectal carcinoma. Bacterial detection was performed by qRT-PCR. Although all of the tested bacteria were detected in the majority of the fecal samples, quantitative differences between the Cancer Group and healthy controls were detected only for F. nucleatum and C. difficile. The three tested oral microorganisms were frequently observed, suggesting a need for furthers studies into a potential role for these bacteria during colorectal carcinoma pathogenesis. Despite the small number of patients included in this study, we were able to detect significantly more F. nucleatum and C. difficile in the Cancer Group patients compared to healthy controls, suggesting a possible role of these bacteria in colon carcinogenesis. This finding should be considered when screening for colorectal cancer.

Espondilodiscitis por Fusobacterium nucleatum: nueva forma de diagnóstico / Spondylodiscitis due to Fusobacterium nucleatum: New diagnostic method

Fusobacterium spp. son bacterias anaerobias Gram negativas. La osteomielitis vertebral por dichas bacterias es muy rara, de hecho, sólo podemos encontrar 11 casos en la literatura. Se presenta un caso de un varón de 46 años con dolor lumbar irradiado a la pierna derecha, de varias semanas de evolución y que no respondió al tratamiento con AINEs. Para el diagnóstico se utiliza la RMN, una biopsia con drenaje de la colección y una PCR universal seguida de secuenciación de ADNr 16S, con la que se obtuvo el diagnóstico microbiológico del paciente, identificando un Fusobacterium nucleatum como responsable. Posteriormente se pautó clindamicina como tratamiento final. En conclusión, la espondilodiscitis por Fusobacterium spp. es una entidad rara y su diagnóstico es a menudo difícil, tanto por las características clínicas como por la dificultad de obtener el diagnóstico microbiológico apropiado. La biopsia vertebral y las técnicas moleculares microbiológicas como la PCR ADNr Universal, son esenciales para la identificación del organismo y permiten la determinación de un diagnóstico y un tratamiento antibiótico apropiados.

Fusobacterium spp. are Gram negative anaerobe bacteria. Vertebral osteomyelitis caused by these bacteria is very unusual; in fact, we could only find 11 cases in the literature. We report the case of a male, 46 year-old patient who had had lumbar pain for several weeks that irradiated to the right leg, and did not respond to NSAID treatment. The work-up included MRI, biopsy with draining of the collection and a universal PCR followed by 16S rDNA sequencing. The latter was used to make the microbiologic diagnosis, which identified Fusobacterium nucleatum as the causative agent. Final treatment consisted of clindamycin. In conclusion, spondylodiscitis due to Fusobacterium spp. is a rare and difficult to diagnose entity, due both to its clinical characteristics and to the difficulty in making the right microbiologic diagnosis. Vertebral biopsy and molecular microbiologic techniques such as Universal PCR rDNa, are essential to identifying the organism, making the diagnosis and prescribing appropriate antibiotic therapy.

Lemierre syndrome with thrombosis of sigmoid sinus following dental extraction: a case report

Lemierre syndrome is caused by an infection in the oropharyngeal region with subsequent thrombophlebitis in the internal jugular vein. The thrombus from the thrombophlebitis can invade other vital organs, such as liver, lungs, or joints, resulting in secondary infection, which further exacerbates the fatal prognosis of this syndrome. Lemierre syndrome, also called postanginal sepsis or necrobacillosis, was first reported by Dr. Lemierre in 1936. In his report, Lemierre mentioned that out of 20 patients who suffered from this syndrome, only two survived. He also stated that all of the 20 patients complained of infections in the palatine tonsils and developed sepsis and thrombophlebitis in the internal jugular vein. Once called a "forgotten disease," this syndrome showed a very high mortality rate until usage of antibiotics became prevalent. In this case report, the authors present a 71-year-old female patient who suffered from Lemierre syndrome with thrombosis extended to the right sigmoid sinus.

Artritis reactiva secundaria a fiebre por mordedura de rata: reporte de un caso clínico / Reactive arthritis secondary to rat-bite fever: report on a clinical case

Caso clínico: Paciente de sexo masculino, de 69 años, sin otros antecedentes. Debuta con dolor en zona de la cadera derecha transitorio, evolucionando con cuadro de seis días de desarrollo de fiebre hasta 39,2ºC, calofríos, artralgias en tarso derecho, rodillas, hombros y astenia, por lo que fue hospitalizado. Al examen destacaba aumento de volumen doloroso en rodilla izquierda y hombro derecho. El estudio de líquido articular descartó artritis infecciosa y presencia de cristales intraarticulares. Los exámenes séricos mostraban parámetros inflamatorios alterados con leucocitosis, VHS y PCR elevados. Panel viral negativo. Sin otro foco inflamatorio evidente, se inició manejo antibiótico empírico con Ceftriaxona y Cloxacilina, con buena respuesta, mejorando su sintomatología y parámetros inflamatorios. Cultivos articulares negativos. El Gram de hemocultivos demostró la presencia de bacilos Gram negativos, aislando en los hemocultivos Streptobacillus moniliformis. El paciente evoluciona favorablemente, con regresión total de su cuadro articular. Discusión y conclusión: La Fiebre por Mordedura de Rata es una enfermedad sistémica que típicamente se presenta con fiebre, rash cutáneo y poliartralgias migratorias. Uno de sus principales agentes causales es el Streptobacillus moniliformis, que coloniza la nasofaringe de ratas y otros roedores. Casos aislados han sido reportados en Chile. En la Fiebre por Mordedura de Rata hasta un 50 por ciento de los pacientes desarrolla artritis con derrame articular o sin él. Puede afectar cualquier articulación, pero la más comúnmente comprometida es la rodilla. El dolor articular disminuye en las primeras tres semanas del uso de antibióticos, pero la articulación en ocasiones puede llegar a ser destruida. En sujetos sanos se han reportado tasas de mortalidad de 10 por ciento a 15 por ciento. Mientras todos los síntomas se resuelven puede haber recaídas con graves complicaciones, como meningitis, endocarditis...

Clinical case: Male patient, 69 years old and no previous record. First episode with transitory pain in the right hip zone, going on to 6 days of fever that evolves to 39.2 ºC, shivers, articular pain in the right tarsus, knees, shoulders and asthenia, so he was hospitalized. Upon examination, painful swellings of the left knee and right shoulder stood out. A study of synovial fluid ruled out infectious arthritis and presence of intra-articular crystals. Blood tests showed altered inflammatory parameters with high leukocytes, VHS and CRP. Negative viral panel. Without another evident inflammatory focus, an empirical management was initiated by means of antibiotics with Ceftriaxone y Cloxaciline, which had a good response relieving symptoms and inflammatory panels. Negative articular culturing. The blood culture Gram showed presence of negative Gram bacilli, with the isolation of Streptobacillus moniliformis in the blood cultures. Patient evolves favorably, with full regression of his articular symptoms. Discussion and conclusion: Rat-bite fever is a systemic sickness that typically presents itself with high fever, skin rash and migratory poly-articular pain. One of its main causing agents is the Streptobacillus moniliformis that colonize the nasopharynx of rats and other rodents. Isolated cases have been reported in Chile. In Rat-bite Fever up to 50 percent of patients develop arthritis with and without joint effusion. It may affect any joint, but that most commonly compromised is the knee. Articular pain subsides in the first 3 weeks of use of antibiotics, but the joint may sometimes even be destroyed. Mortality rates in healthy individuals have been reported at 10 percent to 15 percent. While all symptoms disappear there might be relapses with serious complications such as meningitis, endocarditis, myocarditis, pneumonia and fulminant sepsis that may cause the patient to die. Timely diagnose and treatment are paramount to avoid its serious...

Synergistic growth effect among bacteria recovered from root canal infections

The objective of this study was to determine the ecological relationships between bacterial species that colonize infected root canals. Root canal bacteria recovered from one patient with pulp canal necrosis were evaluated in vitro for synergistic and antagonistic activities determined by mono and co-culture growth kinetics and the production of bacteriocin-like substances using the double layer diffusion method. Peptostreptococcus prevotii triggered a significant increase of Fusobacterium nucleatum growth, while the former bacteria did not affect the growth of P. prevotii. The bacterial species did not produce antagonism activity against itself or against any of the other two species. Despite many studies have demonstrated the capability of root canal microorganisms to produce antagonistic substances, these in vitro experimental tests show the synergistic effect of P. prevotii on the growth of F. nucleatum.

Fusobacterium necrophorum causing infective endocarditis and liver and splenic abscesses / Fusobacterium necrophorum causando endocardite infecciosa e abscesso hepático e esplênico

A 25-year-old male without prior co-morbidities was admitted to hospital with Fusobacterium necrophorum bacteremia, where he was found to have liver and splenic abscesses. Further evaluation with echocardiography revealed a bicuspid aortic valve with severe insufficiency and a 1.68 x 0.86 cm vegetation. The patient required abscess drainage, intravenous antimicrobial therapy and aortic valve replacement. Complete resolution of the infection was achieved after valve replacement and a prolonged course of intravenous antimicrobial therapy. A brief analysis of the patient's clinical course and review of the literature is presented.

Homem de 25 anos de idade, sem antecedentes mórbidos foi admitido ao hospital com bacteremia por Fusobacterium necrophorum e abscessos no fígado e no baço. Avaliação posterior com ecografia revelou válvula aórtica bicúspide com insuficiência severa e vegetação de 1,68 x 0,86 cm. Foi feita drenagem dos abscessos, terapia antimicrobiana intravenosa e substituição da válvula aórtica. Resolução completa da infecção foi conseguida após substituição valvular e curso prolongado de terapêutica intravenosa antimicrobiana. É apresentada breve análise do curso clínico do paciente e revisão da literatura.

A Case of Liver Abscess Caused by Fusobacterium nucleatum in a Patient with Recurrent Periodontal Diseases / 대한소화기학회지

Fusobacteria are anaerobic gram-negative, non-spore forming bacilli found in normal flora of the oral cavity, urogenital tract, and gastrointestinal tract. Fusobacterium nucleatum has been seldom reported as a cause of liver abscess, particularly in immunocompetent hosts. A 55-year-old man with frequent periodontal disease visited our hospital with intermittent fever and headache for 2 months. Abdominal CT scan revealed an 8.2x6 cm mass in the right hepatic lobe with central low density. Abscess culture revealed F. nucleatum as the causative organism. Percutaneous abscess drainage and intravenous administration of antibiotics for 4 weeks improved symptoms and decreased the abscess size. We report a rare case of liver abscess due to F. nucleatum in an immunocompetent man with periodontal disease.

Embolia pulmonar séptica secundária à tromboflebite jugular: um caso de síndrome de Lemierre / Septic pulmonary embolism secondary to jugular thrombophlebitis: a case of Lemierre's syndrome

A síndrome de Lemierre é caracterizada pela infecção aguda da orofaringe, complicada por trombose venosa jugular interna secundária à tromboflebite séptica, e por infecções metastáticas a vários órgãos distantes-mais freqüentemente os pulmões. Relatamos um caso de síndrome de Lemierre em uma mulher de 56 anos que se apresentou com massa cervical à direita e febre. Trombose venosa jugular interna foi demonstrada na ecografia. A tomografia computadorizada de tórax revelou múltiplas opacidades em ambos os pulmões. Uma biópsia pulmonar cirúrgica foi realizada por suspeita de metástases pulmonares. O exame anatomopatológico revelou êmbolos sépticos em parênquima pulmonar. Retrospectivamente, a paciente relatou história de faringite duas semanas antes da hospitalização. Após o diagnóstico, foi tratada com antibióticos de amplo espectro (cefuroxima por 7 dias e azitromicina por 5 dias e, posteriormente, devido à persistência de febre, cefepime por 7 dias). A tomografia computadorizada de tórax, realizada um mês após, mostrou resolução das opacidades.

Lemierre's syndrome is characterized by acute oropharyngeal infection, complicated by internal jugular venous thrombosis secondary to septic thrombophlebitis, and by metastatic infections in various distant organs-most commonly in the lungs. We report a case of Lemierre's syndrome in a 56-year-old female who presented with right-sided neck mass and fever. Right internal jugular venous thrombosis was demonstrated on an ultrasound. A computed tomography scan of the chest revealed multiple opacities throughout both lungs. An open surgical biopsy was performed due to suspicion of pulmonary metastases. Anatomopathological examination revealed septic emboli in lung parenchyma. Retrospectively, the patient reported a history of pharyngitis two weeks prior to hospitalization. After the diagnosis had been made, the patient was treated with broad-spectrum antibiotics (cefuroxime for 7 days and azithromycin for 5 days; subsequently, because fever persisted, cefepime for 7 days). One month later, a computed tomography scan of the chest revealed resolution of the opacities.

prevalence of obligatory anaerobic bacteria in oral cavity infections

Many infections of the oral cavity and adjacent structures involve anaerobic bacteria. Most infections involve multiple anaerobes and in many instances facultative organisms. Present study was conducted regarding to clinical aspects and complications of anaerobic bacterial infections in oral cavity. 72 Specimens were taken from oral cavity infections. Routine culture techniques and strict anaerobic techniques were used for isolation and identification of aerobic, facultative and obligatory anaerobic bacteria respectively. Cultures of all specimens were positive. Mono- bacterial and poly bacterial infections were repored in 1/3 and 2/3 of specimens, respectively. More than 65% of isolated organisms, were obligatory anaerobic belonging to the Peptostreptococcus, Prevotella, Fusobacterium Porphyromonas and Bacteriodes as well as facultative and aerobic species include Streptococcus, Staphylococcus interobacteriacea and Actinomes Israelii are also obtained. Many infections of the oral cavity and adjacent structures involve obligatory anaerobic bacteria. Regarding to results of present study, under the anaerobic atmospheric system, obligatory anaerobic bacteria were isolated and identified from clinical specimens of oral cavity infections, especially abscesses

Genetic diversity of oral Fusobacterium nucleatum isolated from patients with different clinical conditions

Neste estudo foi avaliada a diversidade genética de 23 amostras de Fusobacterium nucleatum isoladas da cavidade bucal de 15 pacientes com doença periodontal, de oito cepas isoladas de sete indivíduos sadios, de nove isoladas de nove pacientes com AIDS e de duas isoladas de dois macacos Cebus apella. Pela ação da enzima EcoRI sobre o DNA bacteriano foram reconhecidos 28 ribotipos agrupados de A a J. Os isolados testados formaram 24 ribotipos os quais foram contidos nos grupos A, B, C, D, E e F, e as três cepas de referência e dois isolados clínicos de A. actinomycetemcomitans e E. coli CDC formaram quatro diferentes ribotipos contidos nos grupos G, H, I e J. Em adição, as nove cepas de F. nucleatum isoladas de pacientes com AIDS, seis pertenciam ao grupo C e três ao grupo D. Usando-se a ribotipagem foi possível distinguir F. nucleatum isolados de diferentes origens.

Influence of subinhibitory concentrations of antimicrobials on hydrophobicity, adherence and ultra-structure of Fusobacterium nucleatum

Fusobacterium nucleatum is considered a bridge organism between earlier and later colonizers in dental biofilms and a putative periodontopathogen. In Dentistry, antimicrobial agents are used for treatment and control of infectious diseases associated with dental plaque. Antiseptics have been used in association with antibiotics to reduce infections after oral surgeries. In this study, the influence of subinhibitory concentrations (SC) of chlorhexidine, triclosan, penicillin G and metronidazole, on hydrophobicity, adherence to oral epithelial cells, and ultra-structure of F. nucleatum was examined. All isolates were susceptible to chlorhexidine, triclosan, and metronidazole; however, most of the isolates were susceptible to penicillin G, and all of them were hydrophilic when grown with or without antimicrobials. Adherence was decreased by all antimicrobials. Results suggest that adherence of F. nucleatum was influenced by adhesins because structures such as fimbries or capsule were not observed by transmission electronic microscope.

Diagnóstico por imágenes / Diagnoses through images

Paciente de 23 años, quien fue remitido a la Fundacion Clinica Valle del Lili por cuadro de 10 dias de evolucion, iniciado luego de ser sometido a extraccion de la cordal inferior izquierda en un consultorio dental. Comienza con dolor y edema en el area del procedimiento, recibe Dicloxacilina y otros antibioticos con incremento de dolor y el edema. Aparece halitosis severa, dolor toracico y dificultad respiratoria progresiva. Al ingreso con una frecuencia respiratoria de 56 por minuto y cardiaca de 97 por minuto, tension arterial de 108/80 y temperatura de 37º C. Presentaba gran edema de cuello y un absceso periodontal izquierdo con salida de abundante material purulento fetido. A la auscultacion presentaba marcada hipoventilacion basal derecha.

Estudio clínico y microbiológico de la enfermedad periodontal del adulto / Clinical and microbiological study of adult periodontal disease

The aim of this study was to carry out a microbiological evaluation of sites with and without clinical evidence of moderate and severe periodontitis and their correlation with clinical parameters. A total of 52 disease sites and 10 healthy sites were selected according to clinical criteria. The following clinical indexes were measured for all the sites: plaque index, gingival index, blood on probing, depth on probing and insertion level. Samples of subgingival plaque were collected for culture and for differential counts of microbial morphotypes. In disease sites the most frequently isolated were: Prevotella intermedia/nigrescens (65), Porphyromonas gingivalis (23), Actinobacillus actinomycetemcomitans (23), Fusobacterium nucleatum (10) and Peptostreptococcus sp. (31). The aerobic gram-positive microflora was predominant in healthy sites. Significant differences were observed in microbial morphotypes between healthy and disease sites: cocci 18.71 and 78.90, motile rods 46.12 and 16.70, total spirochetes 26.48 and 2.80, respectively. The presence of motile rods, spirochetes and P. intermedia/nigrescens were the parameters with most sensitivity to suspect periodontal disease. There were significant differences in the subgingival microflora between healthy and disease sites in patients with moderate and severe periodontitis.