Prevalencia de infección tuberculosa latente e incidencia de viraje tuberculínico en contactos escolares mayores de 5 años en la Ciudad Autónoma de Buenos Aires / Prevalence of latent tuberculosis infection and incidence of tuberculin conversion among school contacts older than 5 years in the City of Buenos Aires

Introducción. La tuberculosis continúa siendo un problema frecuente en contextos de vulnerabilidad socioeconómica. El objetivo principal fue establecer la prevalencia de infección latente y viraje tuberculínico en contactos escolares de casos de tuberculosis. Población y métodos. En un área programática del sur de la ciudad, se evaluó la prevalencia de infección y viraje tuberculínico de 691 niñas, niños y adolescentes utilizando la prueba cutánea de tuberculina. Se investigó la asociación entre pérdida de seguimiento por parte del equipo de salud y características demográficas, escolares y asistencia inicial, y se describió el grado de adherencia cuando la quimioprofilaxis con isoniacida fue indicada. Resultados. Según las definiciones consideradas, la prevalencia de infección latente fue entre el 3,4 % (IC95 %: 2,3-5,2) y el 11,6 % (IC95 %: 9,3-14,4) de los 610 contactos con al menos una prueba cutánea aplicada. La incidencia de viraje tuberculínico se encontró entre el 0,3 % y el 6,8 % de los 294 evaluados. La edad mayor de 18 años, la mayor prevalencia de necesidades básicas insatisfechas en la comuna escolar, la pertenencia al turno escolar vespertino, la negatividad en la baciloscopia del caso índice y la ausencia de aplicación de la prueba cutánea inicial se asociaron con pérdida de seguimiento del contacto. Conclusiones. La incidencia de viraje tuberculínico en contactos escolares fue baja. La adherencia a isoniacida continúa siendo limitada. Se identificaron factores asociados con la pérdida de seguimiento de contactos que podrían orientar estrategias necesarias para mejorar este proceso.

Introduction. Tuberculosis continues to be a common problem in settings of socioeconomic vulnerability. Our primary objective was to establish the prevalence of latent infection and tuberculin conversion among school contacts of tuberculosis cases. Population and methods. In a programmatic area in the south of the City of Buenos Aires, the prevalence of latent infection and tuberculin conversion was assessed in 691 children and adolescents using the tuberculin skin test. The association between loss to follow-up by the health care team and the demographic, school, and baseline care characteristics was studied, and the level of adherence when isoniazid chemoprophylaxis was indicated was described. Results. According to established definitions, the prevalence of latent infection was between 3.4% (95% confidence interval [CI]: 2.3­5.2) and 11.6% (95% CI: 9.3­14.4) in the 610 contacts with at least one skin test. The incidence of tuberculin conversion was between 0.3% and 6.8% in the 294 assessed participants. Age older than 18 years, a higher prevalence of unmet basic needs in the school district, attending the afternoon school shift, negative sputum smear results in the index case, and absence of baseline skin test were associated with contact lost to follow-up. Conclusions. The incidence of tuberculin conversion among school contacts was low. Adherence to isoniazid treatment remains limited. Factors associated with loss of contact tracing were identified, which may guide strategies necessary to improve this process.

ML Flow serological test: complementary tool in leprosy

Abstract Background The evaluation of household contacts of leprosy cases allows the early diagnosis of new cases. Objective To associate the results of the ML Flow test with the clinical characteristics of leprosy cases and to verify their positivity in household contacts, in addition to describing the epidemiological profile of both. Methods Prospective study with patients diagnosed over the course of one year (n = 26), without prior treatment, and their household contacts (n = 44) in six municipalities in northwestern São Paulo, Brazil. Results There was a predominance of men among the leprosy cases, of 61.5% (16/26); 77% (20/26) were over 35 years old; 86.4% (22/26) were multibacillary; 61.5% (16/26) had a positive bacilloscopy; and 65.4% (17/26) had no physical disability. The ML Flow test was positive in 53.8% (14/26) of the leprosy cases and was associated with those who had a positive bacilloscopy and were diagnosed as multibacillary (p-value <0.05). Among the household contacts, 52.3% (23/44) were women and aged over 35 years; 81.8% (36/44) had been vaccinated with BCG ‒ Bacillus Calmette-Guérin. The ML Flow test was positive in 27.3% (12/44) of household contacts, all of whom lived with multibacillary cases; seven lived with positive bacilloscopy cases and six with consanguineous cases. Study limitations Difficulty in convincing the contacts to undergo the evaluation and collection of the clinical sample. Conclusion The ML Flow test, when positive in household contacts, can help the identification of cases that require more attention by the health team, as it indicates a predisposition to disease development, especially when they are household contacts of multibacillary cases, with positive bacilloscopy and consanguineous. The ML Flow test also helps in the correct clinical classification of the leprosy cases.

Challenges of contact tracing during COVID-19 pandemic response in a tertiary hospital in Northwestern Nigeria

Background: Contact tracing is a traditional pillar of infectious disease control, especially for illnesses involving direct transmission from person to person, such as COVID-19. Several challenges have arisen from COVID-19 contact tracing activities, particularly in low-resource settings. These include refusal of positive clients to disclose their close contacts, difficulties in conducting risk assessment for contacts traced, among others. Objectives: To explore the activities and identify challenges of contact tracing during COVID -19 pandemic response in a tertiary hospital in Northwestern Nigeria from May, 2020 to March, 2021. Methodology: Amixed method approach was done with quantitative secondary data analysis of COVID-19 contacts traced, and qualitative assessment through Key Informant Interviews (KII) of Ahmadu Bello University Teaching Hospital staff involved in COVID-19 outbreak response during the period. Results: Atotal of 2,249 clients were tested for COVID-19, of which 925 (41.1%) were healthcare workers. The identified challenges included problems with contact identification, delay in notification of results, refusal to disclose contacts by cases, contacts refusing to allow risk assessment, and health workers being overwhelmed by the task of contact tracing. Conclusion: Challenges identified include refusal of cases to disclose their contacts, overwhelming number of contacts, and delay in notification of results. There is need to institute contact tracing protocols to mandate cases to disclose their contacts, train more manpower to reduce the burden of contact tracing, and improve the notification of results.

Father-Daughter Duo: How Unmasking Leprosy in Father Helped in Leprosy Diagnosis in the Daughter - A Case Report

In highly endemic countries like India, where tuberculosis (TB) and leprosy infection may coexist, screening the other disease before initiating treatment is important to prevent Rifampicin resistance since both diseases are treated with and sensitive to Rifampicin. Here, we report a leprosy case involving the unmasking of leprosy in a treated patient with Pulmonary TB. In this case, a high index of suspicion of Erythema Nodosum Leprosum (ENL) in a patient with no history of leprosy disease or treatment with anti-leprosy drugs was observed. He, however, had a history of taking anti-tuberculous medicine 1.5 years earlier. This case report also acknowledges the physician’s prompt referral of this patient to a dermatologist. Taking a detailed family history and screening helped us diagnose leprosy in the patient’s daughter. It also emphasises the atypical presentation of leprosy, which (although described in textbooks) is being reported here.

Social school contacts of multibacillary leprosy cases in children living in the hyperendemic region of the Midwest of Brazil

Abstract Objective: To analyze the prevalence of Mycobacterium leprae detection and the associated factors among social contacts in the school environment of multibacillary cases living in a hyperendemic municipality of the state of Mato Grosso. Methods: Cross-sectional study with 236 social contacts of multibacillary leprosy from public schools and residents in Cuiabá (Mato Grosso) in 2018. The sources of information were interviews and nasal swab tests for molecular analysis by polymerase chain reaction - PCR. For the prevalence ratio estimates, crude and adjusted analyses were performed using robust Poisson regression and their respective confidence intervals (95% CI). The ArcGIS 9.1 software was used for the geographic distribution analyses. Results: The prevalence of detection of M. leprae in social contacts was 14%. A total of 63.6% of the schools surveyed had 5.1% to 50% of the social contacts of leprosy with positive PCR. The analysis of the geographic distribution in the neighborhoods showed a high prevalence of infection, being higher than 50% in some localities. The highest proportion of positive results occurred in the northern region of the city and from a precarious socioeconomic class. Conclusion: The results showed a high prevalence of detection of M. leprae among social contacts in areas with poor socioeconomic conditions. In these regions, there is a greater risk of

Caracterización de factores clínicos-epidemiológicos en la incidencia de lepra

Introducción: La meta mundial para la eliminación de la lepra, es su detección temprana, lo que requiere un abordaje integral, saber los diversos factores que pueden favorecer su adquisición, para así desarrollar estrategias que contribuyan a su erradicación. Objetivo: Caracterizar los factores clínico-epidemiológicos en la incidencia de lepra del municipio Camagüey. Métodos: Se realizó un estudio observacional, descriptivo, transversal, retrospectivo cuyo universo de trabajo estuvo constituido por todos los pacientes con diagnóstico de lepra en el municipio Camagüey, durante el período de estudio. Las variables estudiadas fueron: formas clínicas según clasificación de Madrid, edad, sexo, primeros síntomas y signos, localización de las lesiones, baciloscopia, modo de detección, fuente de infección y situación del enfermo en relación al foco. La información obtenida fue procesada mediante el paquete estadístico SPSS v21. Los métodos empleados fueron estadística descriptiva de distribución de frecuencias absolutas y relativas. Los resultados del estudio se expusieron en tablas y gráficos. Resultados: La lepra dimorfa fue la de mayor incidencia, prevaleció el grupo de edad entre los 60 y más años con predominio del sexo masculino, más de la mitad de los enfermos presentaron manchas anestésicas como primer síntoma y baciloscopia codificación cero. El modo de detección más relevante fue espontáneo, la fuente de infección la ignorada y en la situación del enfermo en relación al foco prevaleció el caso índice. Conclusiones: Los resultados del estudio evidencian que se hace necesario incrementar la capacitación del personal de la salud y profundizar en las labores de búsqueda de casos.

Introduction: The global goal for the elimination of leprosy is its early detection, which requires a comprehensive approach, knowing the various factors that can favor its acquisition, to develop strategies that contribute to its eradication. Objective: To characterize the clinical-epidemiological factors in the incidence of leprosy in the Camagüey municipality. Methods: A retrospective cross-sectional descriptive observational study was carried out, whose work universe consisted of all the patients with a diagnosis of leprosy in the Camagüey municipality, during the studied period. The variables studied were: clinical forms according to Madrid classification, age, sex, first symptoms and signs, location of the lesions, bacilloscopy, mode of detection, source of infection, and situation of the patient about the focus. The information obtained was processed using the statistical package SPSS v21. The methods used were descriptive statistics of the distribution of absolute and relative frequencies. The results of the study were presented in tables and graphs. Results: Dimorphic leprosy was the one with the highest incidence, the age group between 60 and older prevailed with a predominance of males, more than half of the patients presented anesthetic spots as the first symptom, and smear coding was zero. The most relevant detection mode was spontaneous, the source of infection was ignored, and the index case prevailed in the patient's situation in relation to the outbreak. Conclusions: The results of this study show that it is necessary to increase the training of health personnel and deepen the search for cases.

Household outbreak of sporotrichosis: towards the One Health approach

ABSTRACT Although sporotrichosis requires a broad approach for control, few reports have described the relationship between the index case and secondary contacts. In the present work, we report an outbreak involving a woman, a dog, and two cats from the same household environment, including the clinical and epidemiological aspects and outcomes, and discuss the importance of a One Health approach to face this neglected disease. The joint efforts of professionals such as veterinarians and physicians are essential for early diagnosis and surveillance, which contributes to the rapid identification and control of zoonotic sporotrichosis outbreaks.

Tuberculosis infantil en Chile: ¿de dónde provienen los casos? / Childhood tuberculosis in Chile: where do the cases come from?

La tuberculosis es la principal causa de muerte por un agente infeccioso a nivel mundial y se estima que un 6% de los casos nuevos corresponde a tuberculosis infantil. La presencia de tuberculosis en niños es una señal de la existencia de transmisión del agente en la comunidad. Esta investigación busca describir las características epidemiológicas de la tuberculosis infantil en Chile entre 2011 y 2020. METODOLOGÍA: estudio descriptivo de los casos de tuberculosis infantil registrados en Chile entre los años 2011 y 2020. RESULTADOS: se registraron 544 casos de tuberculosis en menores de 15 años en el período analizado, con una tasa de incidencia anual entre 1,1 y 2,2 casos por 100.000. Se observa un importante aumento de casos en los últimos tres años, especialmente en el grupo de menores de 5 años. 63,2% corresponden a tuberculosis pulmonar, y de ellos 62,3% fueron confirmados por bacteriología. La mayoría de los casos no presenta comorbilidades que impliquen inmunosupresión y la incidencia de meningitis tuberculosa en menores de 5 años es baja. La proporción de contactos es de 29% y la de extranjeros de 17%, ambas variables en aumento en los últimos años. CONCLUSIÓN: La tuberculosis en niños sigue siendo un problema de salud poco frecuente en Chile. Sin embargo, su aumento en los últimos años debe alertar sobre un incremento de la transmisión comunitaria de la enfermedad, por lo que se debe reforzar la detección oportuna de casos contagiantes, la investigación de contactos y el tratamiento preventivo.

Tuberculosis is the leading cause of death from a single infectious agent worldwide and it is estimated that 6% of new cases are children. Childhood tuberculosis reflects ongoing transmission within communities. This study aims to describe the epidemiological characteristics of childhood tuberculosis in Chile between 2011 and 2020. METHODOLOGY: descriptive study of the cases of tuberculosis under 15 years-old registered in Chile from 2011 to 2020. RESULTS: 544 cases were registered in the period analyzed, with an annual incidence rate between 1.1 and 2.2 cases per 100,000. A significant increase in cases is observed in the last three years, especially in the group under 5 years-old. 63.2% correspond to pulmonary tuberculosis, and among them 62.3% are confirmed by bacteriology. Most of the cases do not have comorbidities and the incidence of tuberculous meningitis in children under 5 years is low. Contacts are 29% of the cases and foreigners are 17%, both percentages are increasing in the last years. CONCLUSION: Childhood tuberculosis remains a low frequency health problem in Chile. However, its increase in recent years implies an increase in the community transmission. Active case finding, contact tracing and preventive treatment should be reinforced.

Fatores sociodemográficos e clínicos de casos de hanseníase associados ao desempenho da avaliação de seus contatos no Ceará, 2008-2019 / Factores sociodemográficos y clínicos de los casos de lepra asociados con el desempeño de la evaluación de sus contactos en Ceará, Brasil, 2008-2019 / Socio-demographic and clinical factors of leprosy cases associated with the performance of the evaluation of their contacts in Ceará, Brazil, 2008-2019

Objetivo:Analisar o efeito de características sociodemográficas e clínicas de casos novos (CNs) de hanseníase como determinantes no desempenho da avaliação dos contatos. Métodos: Estudo transversal, com abordagem temporal do indicador de avaliação de 100% os contatos examinados de CNs registrados no Ceará, Brasil, via Sistema de Informação de Agravos de Notificação (Sinan), em 2008-2019. Empregou-se regressão logística para estimar razão de chances-odds ratio (OR) com intervalos de confiança de 95% (IC95%). A tendência temporal baseou-se em regressão joinpoint. Resultados: Foram analisados 23.675 CNs, 65,4% com contatos examinados. Verificou-se maior chance para não avaliação de 100% dos contatos registrados com CN multibacilar (OR=1,19 - IC95% 1,11;1,28) e com exame de contatos como modo de entrada (OR=1,71 - IC95% 1,35;2,18). A tendência temporal do indicador foi de aumento (variação percentual anual: 2,1 - IC95% 1,2;3,0). Conclusão: Dimensões distintas de vulnerabilidade individual e social de CNs de hanseníase influenciam o persistente desempenho insatisfatório da avaliação de contatos.

Objetivo: Analizar la asociación entre características sociodemográficas y clínicas de casos nuevos (CNs) de lepra como determinantes para el desempeño de la evaluación de contactos. Métodos: Estudio transversal con abordaje temporal del indicador de evaluación de 100% de los contactos examinados de cada CN registrado en el Sistema de Información de Enfermedades Notificables del Estado de Ceará, Brasil, 2008-2019. Análisis de regresión logística para estimar la razón de probabilidades (OR) e intervalos de confianza de 95% (IC95%), y tendencia temporal basada por regresión joinpoint. Resultados: Fueron analizados 23.675 CN, 65,4% con contactos examinados. Se verificó mayor probabilidad para la no-evaluación del 100% de los contactos registrados cuando el CN: era multibacilar (OR=1,19 - IC95% 1,11;1,28) y forma de entrada por examen de contactos (OR=1,71 - IC95% 1,35;2,18). Tendencia temporal de aumento de este indicador (cambio porcentual anual: 2,1 (IC95% 1,2;3,0). Conclusión: Diferentes dimensiones de la vulnerabilidad individual y social de los nuevos casos de lepra en Ceará influyen en el desempeño insatisfactorio persistente de la evaluación de sus contactos.

Objective: To analyze the effect of sociodemographic and clinical characteristics of new leprosy cases as determinants in the performance of the evaluation of their contacts Methods: This was a cross-sectional study, with a temporal approach to the evaluation indicator of 100% of contacts examined of each new case (NC) registered in the state of Ceará, Brazil, on the Notifiable Diseases Information System (SINAN), in 2008-2019. Logistic regression was used to estimate odds ratio (OR) with 95% confidence intervals (95%CI). The temporal trends were analyzed using joinpoint regression. Results: 23,675 NCs, 65.4% with contacts examined were analyzed. It was less likely to evaluate 100% of the registered contacts when the new cases were multibacillary (OR=1.19 - 95%CI 1.11;1.28) and with examination of contacts as an entry mode (OR=1.71 - 95%CI 1.35;2.18). There was an increasing temporal trend of the indicator (Annual Percentage Change: 2.1 - 95%CI 1.2;3.0). Conclusion: Distinct dimensions of individual and social vulnerability among new leprosy cases influenced the persistent unsatisfactory performance of the evaluation of contacts.

Transmisión intra-hogar en personas infectadas por SARS-CoV-2 (COVID-19) en Lima, Perú / Transmissão intradomiciliar em pessoas infectadas por SARS-CoV-2 (COVID-19) em Lima, Peru / Household transmission of SARS-CoV-2 (COVID-19) in Lima, Peru

El objetivo fue describir las características de la infección por SARS-CoV-2 entre miembros de hogares, con un caso confirmado primario de COVID-19, en distritos de baja carga de casos en Lima, Perú, en comparación con un distrito de alta carga. Estudio retrospectivo de revisión de base de datos secundaria. Se recolectó información proveniente de una actividad de vigilancia epidemiológica en contactos cercanos (cohabitantes), en 52 hogares de Lima, con un solo miembro con COVID-19. En 10 hogares se realizó una reevaluación. Se evaluaron variables epidemiológicas y clínicas; y su asociación con el resultado a la prueba serológica rápida (presencia de IgG, IgM o ambas). En 40 hogares se encontraron casos secundarios, lo que representa un 49,9% de identificación en promedio por hogar. Se encontró una tasa de ataque secundaria entre cohabitantes de 53% (125 casos), siendo sintomáticos un 77,6% de casos (razón sintomáticos/asintomáticos: 3,5). La presencia de fiebre y/o escalofríos se encontró en el 40% de las personas con resultado positivo, seguido del dolor de garganta en el 39,2%. La ageusia y anosmia estuvieron presentes en el 22,4% y 20,8% de los casos, respectivamente. Al tener un caso primario de COVID-19 en el hogar, la tasa de ataque secundaria de esta infección es de 53%; sin embargo, en una proporción importante de hogares evaluados no hubo un caso positivo, más allá del caso primario. Las características epidemiológicas y clínicas encontradas en este caso estuvieron acorde a lo ya reportado en otras series internacionales.

O objetivo foi descrever as características da infecção por SARS-CoV-2 entre os membros de domicílios, com um caso primário confirmado de COVID-19, em distritos com baixa carga de casos em Lima, Peru, em comparação com um distrito com alta carga. Estudo retrospectivo de revisão de banco de dados secundário. As informações foram coletadas em uma atividade de vigilância epidemiológica em contatos próximos (coabitantes), em 52 domicílios em Lima, com um único membro com COVID-19. Foi realizada uma reavaliação em 10 domicílios. Variáveis ​​epidemiológicas e clínicas foram avaliadas; e sua associação com o resultado do teste sorológico rápido (presença de IgG, IgM ou ambos). Os casos secundários foram encontrados em 40 domicílios, representando uma taxa média de identificação de 49,9% por domicílio. Foi encontrada uma taxa de ataque secundário entre coabitantes de 53% (125 casos), com 77,6% dos casos sendo sintomáticos (relação sintomático/assintomático: 3,5). A presença de febre e/ou calafrios foi encontrada em 40% das pessoas com resultado positivo, seguida de dor de garganta em 39,2%. Ageusia e anosmia estiveram presentes em 22,4% e 20,8% dos casos, respectivamente. Quando há um caso primário de COVID-19 em casa, a taxa de ataque secundário para essa infecção é de 53%; No entanto, em uma proporção significativa dos domicílios avaliados não houve caso positivo, além do caso primário. As características epidemiológicas e clínicas encontradas neste caso foram consistentes com o que já foi relatado em outras séries internacionais.

The study aimed to describe the characteristics of SARS-CoV-2 transmission among members of households with a confirmed primary case of COVID-19 in districts with low burden of cases in Lima, Peru, compared to a district with high burden. This was a retrospective study with a secondary database review. Information was collected from an epidemiological surveillance activity in close contacts (household members) in 52 households in Lima, with a single member with COVID-19. Reevaluation was conducted in 10 households. The study evaluated epidemiological and clinical variables and their association with the result of the rapid serological test (presence of IgG, IgM, or both). Secondary cases were found in 40 households, representing mean identification of 49.9% per household. Secondary attack rate in household members was 53% (125 cases), and symptomatic individuals accounted for 77.6% of cases (symptomatic/asymptomatic ratio: 3.5). Presence of fever and/or chills was found in 40% of persons with positive test results, followed by sore throat with 39.2%. Ageusia and anosmia were present in 22.4% and 20.8% of cases, respectively. When there was a primary case of COVID-19 in the household, the secondary attack rate was 53%; however, in an important proportion of households there were no positive cases other than the primary case. The epidemiological and clinical findings were consistent with reports from other international series.

Modelling the impact of contact tracing of symptomatic individuals on the COVID-19 epidemic

OBJECTIVES: With the declining numbers of coronavirus disease 2019 (COVID-19) cases in the state of São Paulo, Brazil, social distancing measures have gradually been lifted. However, the risk of a surge in the number of cases cannot be overlooked. Even with the adoption of nonpharmaceutical interventions, such as restrictions on mass gatherings, wearing of masks, and complete or partial closure of schools, other public health measures may help control the epidemic. We aimed to evaluate the impact of the contact tracing of symptomatic individuals on the COVID-19 epidemic regardless of the use of diagnostic testing. METHODS: We developed a mathematical model that includes isolation of symptomatic individuals and tracing of contacts to assess the effects of the contact tracing of symptomatic individuals on the COVID-19 epidemic in the state of São Paulo. RESULTS: For a selection efficacy (proportion of isolated contacts who are infected) of 80%, cases and deaths may be reduced by 80% after 60 days when 5000 symptomatic individuals are isolated per day, each of them together with 10 contacts. On the other hand, for a selection efficacy of 20%, the number of cases and deaths may be reduced by approximately 40% and 50%, respectively, compared with the scenario in which no contact-tracing strategy is implemented. CONCLUSION: Contact tracing of symptomatic individuals may potentially be an alternative strategy when the number of diagnostic tests available is not sufficient for massive testing.

Utility of early diagnosis, contact tracing and stakeholder engagement in outbreak response in three COVID-19 outbreak settings in Ghana

Objective: To describe how early case detection, testing and contact tracing measures were deployed by stakeholders in response to the COVID-19 outbreak in Ghana ­ using three outbreak scenarios. Design: A descriptive assessment of three case studies of COVID-19 outbreaks within three settings that occurred in Ghana from March 13 till the end of June 2020. Setting: A construction camp, a factory and a training institution in Ghana. Participants: Staff of a construction camp, a factory, workers and students of a training institution. Interventions: We described and compared the three COVID-19 outbreak scenarios in Ghana, highlighting identification and diagnosis of cases, testing, contact tracing and stakeholder engagement for each scenario. We also outlined the challenges and lessons learnt in the management of these scenarios. Main outcome measures: Approach used for diagnosis, testing, contact tracing and stakeholder engagement. Results: Index cases of the training institution and construction camp were screened the same day of reporting symptoms, whiles the factory index case required a second visit before the screening. All index cases were tested with RTPCR. The training institution followed and tested all contacts, and an enhanced contact tracing approach was conducted for staff of the other two sites. Multi-sectorial engagement and collaboration with stakeholders enabled effective handling of the outbreak response in all sites. Conclusion: Comparing all three settings, early diagnosis and prompt actions taken through multi-sectorial collaborations played a major role in controlling the outbreak. Engaging stakeholders in the COVID-19 response is an effective way to mitigate the challenges in responding to the pandemic.

Risk of developing tuberculosis in T-cell spot test of tuberculosis infection positive close contacts of tuberculosis patients in Shanghai: a prospective observational study / 中华传染病杂志

Objective:To investigate the risk and temporal characteristics of tuberculosis (TB) in persons with latent tuberculosis infection (LTBI) among close contacts of TB patients in Shanghai.Methods:This was a prospective observational study, the study subjects were the close contacts of TB patients who tested positive for Mycobacterium tuberculosis infection by T-cell spot test of tuberculosis infection (T-SPOT.TB) among the registered population in seven districts of Shanghai from 2009 to 2010. Questionnaire interview was applied to investigate the basic information and contact history.The LTBI cases during nine consecutive years were identified through the TB registration and reporting system.Cumulative incidence rate and incidence density of TB in tuberculosis-infected close contacts were estimated. Chi-square test was used to compare the incidence rate among different sex and age groups. Results:In total, 376 pulmonary TB patients and their 982 close contacts were enrolled in the baseline survey from 2009 to 2010. Of them, 287 close contacts were tested positive for Mycobacterium tuberculosis infection by T-SPOT.TB.The median age of persons with LTBI at the time of survey was 54 years old, and 36.6%(105/287) were male. By the end of December 2019, five new TB cases were detected among the 287 close contacts with LTBI. The two-year and five-year cumulative incidence were 0.35% and 1.05%, respectively. The nine-year cumulative incidence was 1.74%(95% confidence interval 0.57%-4.02%). The median duration for TB occurrence was 3.67 years. The incidence density of TB was 1.875/1 000 person-years with a total of 2 666.75 observation person-years. There were no significant differences in the nine-year cumulative incidence of TB among close contacts with LTBI by age and sex ( χ2=0.600, <0.001, respectively, both P>0.05). Conclusion:The occurrence of TB among close contacts with LTBI is concentrated in the first five years after TB contact.

Tuberculin skin test in close contacts in case of school tuberculosis outbreak / 中国学校卫生

Objective@#To evaluate the role of tuberculin skin test prified protein derivative (PPD) in defining the screening scope of close contacts of tuberculosis cases in disposal of tuberculosis outbreak in schools.@*Methods@#In a senior middle school in August 2019, 1 553 students of the grade two were tested by PPD because of a school tuberculosis outbreak. PPD results were compared to grade one students without any association with this tuberculosis epidemic, who were also tested by PPD when beginning school. Potential association between PPD distribution characteristics and tuberculosis case distribution were analyzed.@*Results@#Twenty nine grade two students were diagnozed as tuberculosis infection, seven of which were PPD positive, and with the same MIRU-VNTR genotype. In grade one, 0.1 % (1/796) student showed strong PPD positive, 34.3% (273/796) student showed positive. For grade two students, significant higher rate of strong PPD positive [5.9% (45/757)], and PPD positive [52.0% (394/757)] were observed ( χ 2=45.71, 49.90, P <0.01). Proportion of strong PPD positive in the first floor of the teaching building ( 19.4 %), where tuberculosis cases clustered, was significantly higher than that in other floors ( χ 2=89.81, P <0.01); Number of strong PPD positive students increased with TB cases in each floor of the teaching building ( r =0.99, P <0.01). Proportion of strong PPD positive and PPD positive in floors of the dormitory, where TB cases lived, was significantly higher than in other floors ( χ 2=49.4, 64.9 , P <0.01). Number of strong PPD positive and PPD positive students increased with TB cases in each floor of the teaching building ( r =0.84, 0.56, P <0.01).@*Conclusion@#Strong PPD positive rate well reflects tuberculosis infection of close contacts, and is recommended for defining the scope of screening.

Industry and workplace characteristics associated with the downloading of a COVID-19 contact tracing app in Japan: a nation-wide cross-sectional study

BACKGROUND@#To combat coronavirus disease 2019 (COVID-19), many countries have used contact tracing apps, including Japan's voluntary-use contact-confirming application (COCOA). The current study aimed to identify industry and workplace characteristics associated with the downloading of this COVID-19 contact tracing app.@*METHODS@#This cross-sectional study of full-time workers used an online survey. Multiple logistic regression analysis was used to evaluate the associations of industry and workplace characteristics with contact tracing app use.@*RESULTS@#Of the 27,036 participants, 25.1% had downloaded the COCOA. Workers in the public service (adjusted odds ratio [aOR] = 1.29, 95% confidence interval [CI] 1.14-1.45) and information technology (aOR = 1.38, 95% CI 1.20-1.58) industries were more likely to use the app than were those in the manufacturing industry. In contrast, app usage was less common among workers in the retail and wholesale (aOR = 0.87, 95% CI 0.76-0.99) and food/beverage (aOR = 0.81, 95% CI 0.70-0.94) industries, but further adjustment for company size attenuated these associations. Workers at larger companies were more likely to use the app. Compared with permanent employees, the odds of using the app were higher for managers and civil servants but lower for those who were self-employed.@*CONCLUSIONS@#Downloading of COCOA among Japanese workers was insufficient; thus, the mitigating effect of COCOA on the COVID-19 pandemic is considered to be limited. One possible reason for the under-implementation of the contact tracing app in the retail and wholesale and food/beverage industries is small company size, as suggested by the fully adjusted model results. An awareness campaign should be conducted to promote the widespread use of the contact tracing app in these industries.

Estrategia de pesquisa sistemática y seguimiento prolongado revela alto número de nuevas infecciones tuberculosas en contactos adultos en la Región Metropolitana, Chile / Systematic screening of adult household contacts of patients with active pulmonary tuberculosis reveals high rates of new infections during follow-up

Background: Contact investigation is cardinal in the control of tuberculosis (TB) since it helps to stop its transmission. In Chile, the National TB Program strategy does not include latent TB infection testing, regular chemoprophylaxis or follow-up in adults. Active TB was found in only 1.2% of contacts at country-level during 2018. Aim: To evaluate the performance of a systematic screening of adult household contacts with targeted chemoprophylaxis and prolonged active follow-up. Material and Methods: Prospective cohort of household contacts in Santiago. Two face-to-face visits (at 0 and 12 weeks) that included QuantiFERON TB-Gold plus tests (QFT), chest radiography (CXR) at 0 and 24 weeks and, periodic text messaging or phone call follow-up for up to 48 weeks were implemented. Contacts with positive QFT were referred for TB chemoprophylaxis. Results: A total of 200 contacts were enrolled, 69% were migrants. At baseline evaluation, 45% had a positive QFT result and 1.6% had co-prevalent active TB. At follow-up, 13% contacts further converted to QFT (+), and 5.1% more were diagnosed with active TB (mean follow-up time 32 weeks). Of these 10 further active TB cases, 6 (60%) had a negative QFT and all (100%) had normal CXR at baseline; while three cases occurred in QFT converters. Conclusions: In this cohort of household contacts, 6.7 % were diagnosed with active TB (more than 2/3 at follow-up) and 13% had a late QFT (+) conversion. Active and prolonged contacts' follow-up are essential to detect new infections and tackle the TB epidemic in Chile.

Falhas operacionais no controle da hanseníase em redes de convívio domiciliar com sobreposição de casos em áreas endêmicas no Brasil / Fallas operacionales en el control de la lepra en redes de convivencia domiciliar con sobreposición de casos en zonas endémicas de Brasil / Operational failures of leprosy control in household social networks with overlapping cases in endemic areas in Brazil

Objetivo: Analisar a vulnerabilidade institucional/programática de serviços de saúde no desenvolvimento das ações de atenção a pessoas acometidas pela hanseníase e de vigilância de contatos. Métodos: Estudo transversal, conduzido em 2017, sobre dados primários de amostra de casos de hanseníase notificados no período 2001-2014, com sobreposição de casos em redes de convívio domiciliar (RCD), em municípios dos estados da Bahia, Piauí e Rondônia, Brasil. Resultados: Dos 233 casos de hanseníase analisados, 154 (66,1%) pertenciam a RCD com 3 ou mais casos de hanseníase. Em 53,2% dos casos, houve acometimento de duas ou mais gerações, um desfecho significativamente associado a não realização do exame dermato-neurológico (razão de prevalências [RP] 1,32; intervalo de confiança [IC95%1,10;1,59]; p-valor=0,004). Conclusão: Falhas operacionais na vigilância de contatos de hanseníase em áreas de alta endemicidade reforçam o caráter de vulnerabilidade institucional/programática em contextos de RCD com mais de um caso de hanseníase, nos três estados analisados.

Objetivo: Analizar la vulnerabilidad institucional/programática de los servicios de salud para el desarrollo de acciones de atención a personas afectadas por lepra y de vigilancia de sus contactos. Métodos: Estudio transversal realizado en 2017 basado en datos primarios de una muestra de casos de lepra notificados entre 2001-2014 con casos superpuestos en redes de convivencia domiciliar (RCD) en Municipios de los Estados de Bahía, Piauí y Rondônia, Brasil. Resultados: Del total de 233 casos de lepra analizados, 154 (66,1%) pertenecían a RCD con 3 o más casos de lepra. En el 53.2% de los casos hubo 2 o más generaciones afectadas, resultado significativamente asociado con la no realización del dermato-neurológico (razón de prevalencias [RP] 1,32; intervalo de confianza [IC95%1,10;1,59]; valor-p=0.004). Conclusión: Las fallas operativas en la vigilancia de los contactos de lepra en áreas de alta endemicidad refuerzan el carácter de vulnerabilidad institucional/programática en los contextos de redes de convivencia domiciliar (RCD) con más de un caso de lepra en los tres estados analizados.

Objective: To analyze institutional/programmatic vulnerability of health services in the development of health care actions for people affected by leprosy and contact surveillance. Methods: This was a cross-sectional study conducted in 2017 based on primary data from a sample of leprosy cases notified between 2001-2014 with overlapping cases in household social networks (HSN) in municipalities in the states of Bahia, Piauí and Rondônia, Brazil. Results: A total of 233 leprosy cases were analyzed, 154 (66.1%) belonged to HSN with 3 or more leprosy cases. In 53.2% of cases, 2 or more generations were affected, this being an outcome associated with absence of dermato-neurological examination (prevalence ratio 1.32; confidence interval [95%CI 1.10;1.59]; p-value=0.004). Conclusion: Operational failures in the surveillance of leprosy contacts in areas of high endemicity reinforce the character of institutional/programmatic vulnerability in HSN contexts with more than one case of leprosy in the three states analyzed.

Estratégias de notificação de parceiros sexuais de pessoas com infecções sexualmente transmissíveis: ensaio clínico randomizado / Estrategias para reportar parejas sexuales de personas con enfermedades de transmisión sexual: ensayo clínico randomizado / Strategies for notifying sexual partners of people with sexually transmitted infections: a randomized clinical trial*

RESUMO Objetivo Comparar a efetividade da comunicação verbal e por cartão no comparecimento de parceiros sexuais de pessoas com infecções sexualmente transmissíveis com fatores associados ao seu êxito. Método Ensaio clínico, controlado, randomizado, cuja intervenção consistiu no oferecimento de um cartão de notificação para os pacientes-índices entregarem aos seus parceiros. Resultados A amostra foi de 189 pacientes-índices, 94 do grupo controle que convidaram verbalmente os parceiros sexuais para atendimento e 95 do grupo intervenção que levaram o cartão de notificação de parceiros como forma de convite para atendimento. Houve comparecimento de 52,6% dos parceiros convidados por cartão, e 43,6% dos convidados verbalmente, mas sem diferença estatística significativa (p=0,215). Os fatores associados ao não êxito no comparecimento de parceiros foram: não residir com o parceiro (p=0,0001), não ter parceiros fixos (p=0,0001), ter parceria casual (p=0,028) e usar preservativo com parceiro fixo (p=0,045). O tipo de infecção não influenciou a vinda do parceiro. Conclusão Face à ausência de maior efetividade na notificação por cartão, recomenda-se outro modelo de cartão contendo informações destinadas a parceiros para ser usado combinado a outros métodos. Registro Brasileiro de Ensaios Clínicos: RBR-7jp5mr.

RESUMEN Objetivo Comparar efectividad de comunicación oral y por tarjeta en la comparecencia de parejas sexuales de personas con enfermedades de transmisión sexual y factores asociados a su éxito. Método Ensayo clínico, controlado, randomizado, con participación consistente en entrega de tarjeta informativa para que los pacientes indicados entreguen a sus parejas. Resultados Muestra de 189 pacientes indicados, 94 del grupo control, que invitaron verbalmente a sus parejas sexuales para atención, y 95 del grupo intervención, que entregaron tarjeta de reporte de parejas como medio de citación a su atención. Comparecieron 52,6% de las parejas invitadas vía tarjeta, y 43,6% de citados oralmente, sin diferencia estadísticamente significante (p=0,215). Los factores asociados al fracaso de la comparecencia de parejas fueron: no residir con la pareja (p=0,0001), tener una relación casual (p=0,028) y utilizar preservativos con la pareja fija (p=0,045). El tipo de infección no influyó en la comparecencia de la pareja. Conclusión Considerando carencia de mayor efectividad del reporte vía tarjeta, se recomienda otro modelo de la misma incluyendo información destinada a parejas para utilizarse combinada con otros métodos. Registro Brasileño de Ensayos Clínicos: RBR-7jp5mr.

ABSTRACT Objective To compare the effectiveness of verbal communication and communication by card in getting sexual partners of people with sexually transmitted infections to attend a health service and the factors associated with the success of these types of communication. Method Clinical, controlled, and randomized study, whose intervention was offering a reporting card for index patients to hand to their sexual partners. Results The sample was 189 index patients, 94 of whom were in the control group, and verbally invited their sexual partners to receive care, and 95 were allocated to the intervention group, and took their partner's reporting card to their partners as a way to invite them to receive care. The percentage of partners invited by card who came to the service was 52.6%, in contrast with 43.6% among partners who were invited verbally, but no significant statistical difference was found (p=0.215). The factors associated with failure to convince partners to come to the service were: not living with the partner (p=0.0001); not having a steady partner (p=0.0001); having casual partners (p=0.028); and using condoms with a steady partner (p=0.045). The infection type did not influence the studied partners' visits to the service. Conclusion Given the failure to achieve effectiveness when applying the reporting by card, the authors recommend another card model containing information for partners to be used in combination with other methods. Brazilian Clinical Trials Registry: RBR-7jp5mr.

Risk of infection and disease progression in children exposed to tuberculosis at home, Colombia / Riesgo de infección y progresión de la enfermedad en niños expuestos a tuberculosis en el hogar, Colombia

Abstract Aim: To assess the risk of tuberculosis (infection and disease) in children less than 15 years' old who are household contacts of pulmonary tuberculosis patients in three Colombian cities (Medellín, Cali, and Popayán). Methods: A cohort of 1,040 children household contacts of 380 adults with smear-positive pulmonary tuberculosis was followed up for 24 months. Study period 2005-2009. Results: Tuberculin skin test was positive (≥10 mm) in 43.7% (95% CI: 39.2-48.2). Tuberculin skin test positivity was associated with age 10-14 years (Prevalence Ratio -PR= 1.43, 95% CI: 1.1-1.9), having a BCG vaccine scar (PR= 1.52, 95% CI: 1.1-2.1), underweight, closer proximity to the index case and exposure time >3 months. The annual risk of infection (tuberculin skin test induration increase of 6 mm or more per year) was 17% (95% CI: 11.8-22.2) and was associated with a bacillary load of the adult index case (Relative Risk -RR= 2.12, 95% CI: 1.0-4.3). The incidence rate of active tuberculosis was 12.4 cases per 1,000 persons-year. Children <5 years without BCG vaccine scar had a greater risk of developing active disease (Hazard Ratio -HR= 6.00, 95% CI: 1.3-28.3) than those with scar (HR= 1.33, 95% CI: 0.5-3.4). The risk of developing active tuberculosis augmented along with the increase from initial tuberculin skin test (tuberculin skin test 5-9 mm HR= 8.55, 95% CI: 2.5-29.2; tuberculin skin test ≥10 mm HR= 8.16, 95% CI: 2.0-32.9). Conclusions: There is a need for prompt interruption of adult-to-children tuberculosis transmission within households. Conducting proper contact investigation and offering chemoprophylaxis to infected children could reduce tuberculosis transmission.

Resumen Objetivo: Evaluar el riesgo de tuberculosis (infección y enfermedad) en niños menores de 15 años de edad convivientes de pacientes con tuberculosis pulmonar en tres ciudades colombianas (Medellín, Cali y Popayán). Métodos: Se siguió durante 24 meses una cohorte de 1,040 niños convivientes de 380 adultos con tuberculosis pulmonar bacilífera. Periodo de estudio 2005-2009. Resultados: La prueba de tuberculina fue positiva (≥10 mm) en el 43.7% (IC 95%: 39.2-48.2), y estuvo asociada con la edad de 10-14 años (Razón de Prevalencia-RP= 1.43, IC 95%: 1.1-1.9), tener cicatriz de la vacuna BCG (RP= 1.52, IC 95%: 1.1-2.1). El riesgo anual de infección (aumento de la induración en la prueba de tuberculina de 6 mm o más al año) fue 17% (IC 95%: 11.8-22.2), y estuvo asociado con mayor carga bacilar en el adulto con tuberculosis pulmonar (Riesgo Relativo-RR= 2.12, IC 95%: 1.0-4.3). La tasa de incidencia de tuberculosis activa fue de 12.4 casos por 1,000 años-persona de seguimiento. Los niños menores de 5 años sin cicatriz de vacuna BCG tuvieron un mayor riesgo de desarrollar tuberculosis activa (Razón de Peligro -HR= 6.00, IC 95%: 1.3-28.3), que quienes tenían cicatriz (HR= 1.33, IC 95%: 0.5-3.4). El riesgo de desarrollar tuberculosis activa aumentó conforme el aumento de la prueba de tuberculina inicial (prueba de tuberculina 5-9 mm HR= 8.55, IC 95%: 2.5-29.2; prueba de tuberculina ≥10 mm HR= 8.16, IC 95%: 2.0-32.9). Conclusión: Es necesario interrumpir rápidamente la transmisión de tuberculosis de adultos a niños en los hogares. Realizar investigaciones de contacto apropiadas y ofrecer quimioprofilaxis a los niños infectados podría reducir la transmisión de la tuberculosis.

Development and evaluation of an application for syphilis control / Desarrollo y evaluación de un aplicación para el control de la sífilis en gestantes / Desenvolvimento e avaliação de um aplicativo para o controle da sífilis em gestantes

ABSTRACT Objective: to develop and evaluate an application for syphilis control in pregnant women. Method: methodological research developed between March and November of 2016 in two phases: bibliographic survey of the years 2012 to 2016 in the databases PubMed, CAPES and Scopus and application development. Eight users participated in the usability test and five doctors and five nurses working in prenatal care participated in the evaluation. Results: the application contains informative video, information about the disease, map of health clinics, agenda function and anonymous notification. The evaluation of the objective, function and relevance was considered adequate with value higher than 0.80 in all items of the Content Validity Index. Final considerations: the application makes easier the routine of health services in the context of health promotion, in the convocation and treatment of pregnant women and their partners.

RESUMEN Objetivo: desarrollar y evaluar una aplicación para el control de la sífilis en gestantes. Método: Investigación metodológica desarrollada en el período de marzo a noviembre de 2016, en dos fases: levantamiento bibliográfico de los años 2012 a 2016 en las bases de datos PubMed, CAPES y Scopus y desarrollo de la aplicación. Participaron de la prueba de usabilidad ocho usuarios y de la evaluación cinco médicos y cinco enfermeras que actuaban en el prenatal. Resultados: la aplicación contiene vídeo informativo, información sobre la enfermedad, mapa de los puestos de salud, función de agenda y notificación anónima. La evaluación del objetivo, función y relevancia se consideró adecuada con un valor superior a 0,80 en todos los ítems del Índice de Validación de Contenido. Consideraciones finales: la aplicación facilita la rutina de los servicios de salud en el contexto de promoción de la salud, en la convocatoria y tratamiento de gestantes y sus parejas.

RESUMO Objetivo: desenvolver e avaliar um aplicativo para o controle da sífilis em gestantes. Método: pesquisa metodológica desenvolvida no período de março a novembro de 2016, em duas fases: levantamento bibliográfico dos anos de 2012 a 2016 nas bases de dados PubMed, CAPES e Scopus e desenvolvimento do aplicativo. Participaram do teste de usabilidade: oito usuários e da avaliação cinco médicas e cinco enfermeiras que atuavam no pré-natal. Resultados: o aplicativo contém vídeo informativo, informações sobre a doença, mapa dos postos de saúde, função de agenda e notificação anônima. A avaliação do objetivo, função e relevância foi considerada adequada com valor superior a 0,80 em todos os itens do Índice de Validação de Conteúdo. Considerações finais: o aplicativo facilita a rotina dos serviços de saúde no contexto de promoção da saúde, na convocação e tratamento de gestantes e seus parceiros.