ABSTRACT BACKGROUND: Dengue is considered to be the most important arbovirus worldwide, with important complications that increase its lethality. In Brazil, an endemic country, the disease reaches significant incidence levels, with occurrences of serious cases and high costs of hospitalizations for its treatment. OBJECTIVE: To analyze risk factors among individuals with recent histories of dengue infection in a medium-sized city in Mato Grosso. DESIGN AND SETTING: Descriptive cross-sectional study, of epidemiological-survey type, conducted among the urban population of a city located in mid-northern Mato Grosso. METHODS: A seroepidemiological survey using questionnaires and collection of biological material was conducted among 596 adults aged ≥ 18 years who had been selected through a cluster sampling process. Positive dengue cases were those with positive results from anti-dengue immunoassays (ELISA). Statistical analyses with descriptive and inferential techniques were used, with 95% confidence intervals and a 5% significance level. RESULTS: The seroepidemiological profile of the study participants was predominantly female, with ages between 18 and 39 years, self-declared non-white race/color, not more than eight years of education and not living with a companion. Among the sanitary factors analyzed, the following were risk factors for dengue virus infection: no running water at home; no water supply from the public piped network; no waste from drains or toilets sent to the sewage network; endemic disease combat agents visiting the home; and presence of mosquito breeding sites at home. CONCLUSION: Low schooling levels and previous dengue virus infection were associated with current dengue virus infection.

Resumen Introducción: el virus chikunugnya ya se ha identificado en más de 60 países de Asia, África, Europa y América, y la cronicidad después de la enfermedad afecta la vida de los afectados por el virus, así como la sociedad, la economía y la salud pública. El objetivo fue caracterizar, mediante encuestas epidemiológicas, el perfil de la infección por chikungunya en un municipio de tamaño medio en Mato Grosso de acuerdo con factores sociodemográficos y sanitarios. Métodos: La encuesta epidemiológica en suero se realizó con 596 adultos de ≥ 18 años seleccionados mediante un proceso de muestreo por conglomerados, con aplicación de cuestionarios y recolección de material biológico. Los casos positivos de fiebre chikungunya fueron aquellos con resultados positivos en el inmunoensayo enzimático del virus anti-chikungunya (ELISA). Los análisis estadísticos utilizaron técnicas descriptivas e inferenciales con intervalos de confianza del 95% y un nivel de significación del 5%. Resultados: La prevalencia general de fiebre chikungunya encontrada en la comunidad fue de 8.4%. El perfil de infección por fiebre chikungunya está compuesto por mujeres (p <0.204), con edades comprendidas entre 18 y 39 años (p <0.780), más de 08 años de estudio (p <0.079), raza/color no blanco (p <0.871) y empleado en los últimos 12 meses (p <0.927). No residir con compañero afectivo fue estadísticamente significativo para la infección por el virus chikungunya (CHIKV) (p <0.028). Conclusión: El estudio encontró que las mujeres son las más afectadas por la infección, además de ser solteras representaban un factor de riesgo, y los comportamientos de riesgo, como la presencia de larvas y la cría de mosquitos en el hogar, reflejan un bajo nivel de conciencia de la enfermedad.

Abstract Introduction: The chikungunya virus has already been identified in more than 60 countries in Asia, Africa, Europe and the Americas, and chronicity after the disease impacts the lives of those affected by the virus, as well as society, the economy and public health. The objective was to characterize, through epidemiological survey, the profile of chikungunya infection in a mid-sized municipality in Mato Grosso according to sociodemographic and sanitary factors. Methods: The serum-epidemiological survey was conducted with 596 adults aged ≥ 18 years selected by cluster sampling process, with application of questionnaires and biological material collection. Positive cases of chikungunya fever were those with positive results in the anti-chikungunya virus enzyme immunoassay (ELISA). The statistical analyses used descriptive and inferential techniques with confidence intervals of 95% and a significance level of 5%. Results: The overall prevalence of chikungunya fever found in the community was 8.4%. The profile of infection by chikungunya fever is composed of women (p<0.204), aged between 18 and 39 years (p<0.780), more than 08 years of study (p<0.079), non-white reported race/color p<0.871) and employed in the past 12 months (p<0.927). Not residing with affective companion was statistically significant for infection by chikungunya virus (CHIKV) (p<0.028). Conclusion: The study found that women are the most affected by the infection, as well as being single represented a risk factor, and risk behaviors, such as presence of larvae and breeding of mosquitos at home, reflect a low level of awareness of the disease.

ABSTRACT Infections caused by arboviruses that have mostly impacted the Brazilian morbidity and mortality are caused by the same vector, Aedes aegypti. Preventive actions related to the vector are the most effective strategies in the prevention and control of these diseases. This study aimed to associate the knowledge on the vector that transmits dengue, Zika and chikungunya with the sociodemographic and behavioral preventive practices towards Aedes aegypti in the municipality of Tangara da Serra, Mato Grosso State, in the Brazilian Legal Amazon. A probabilistic urban population sampling was obtained by clusters: census sectors and households. The sample size calculation considered 10% of loss and a 1.5 design effect. This is a cross-sectional research carried out through a household survey in February and March 2018. There were 583 participants. The study variables were knowledge on the vector, sociodemographic characteristics and preventive practices related to the vector. The statistical analysis was based on a bivariate analysis and Poisson multiple regressions. Inadequate or insufficient knowledge on the vector Aedes aegypti remained associated with education in the categories illiterate (p<0.001) and 8 years of study or less (p<0.001), in addition to not adopting practices of capping and cleaning the water tank (p=0.002) and not using insecticides at home (p=0.007). It is concluded that there is a need for health communication actions that consider characteristics the population, especially the level of education and previous knowledge on the vector, allowing a dialogical approach and enabling the community participation in preventive practices and control of the vector Aedes aegypti .

RESUMO O objetivo do estudo foi avaliar o desenvolvimento motor de crianças expostas ao ZIKV, nascidas com perímetro cefálico normal (PC). Estudo transversal. Trinta e uma crianças participaram do estudo, distribuídas em dois grupos: 15 crianças cujas mães foram infectadas pelo ZIKV durante a gravidez, nascidas com PC medido entre −1,9 e +2 escores Z ajustados para sexo e idade gestacional (grupo exposto); e 16 controles aleatoriamente selecionados pareados por sexo e idade, sem exposição pré-natal conhecida ao ZIKV (grupo não exposto). Alberta Infant Motor Scale (AIMS) foi usado para avaliar o desenvolvimento motor grosso. Não houve diferenças significativas entre os grupos expostos e não expostos. Embora reconfortante, devemos destacar que o AIMS é um teste de triagem e apenas avalia o desenvolvimento motor grosso, e nossa amostra foi pequena. Portanto, crianças expostas ao ZIKV na gravidez devem ser continuamente avaliadas quanto a diferentes aspectos de seu desenvolvimento.

ABSTRACT This cross-sectional study sought to evaluate motor development in infants exposed to ZIKV born with normal head circumference (HC). Thirty one children, distributed into two groups, participated in the study: 15 whose mothers were infected by ZIKV during pregnancy, born with HC from −1.9 to +2 Z-scores, adjusted for sex and gestational age (exposed group); and 16 randomly selected infants without known prenatal exposure to ZIKV, paired by sex and age (control group). Alberta Infant Motor Scale (AIMS) was used to evaluate gross motor development. We found no significant difference between the exposed and control groups. However, considering that AIMS is a screening test that assesses only the gross motor development and the small size of our sample, infants exposed to ZIKV during pregnancy should be continuously evaluated for different aspects of their development.

RESUMEN El presente estudio objetivó evaluar el desarrollo motor de niños expuestos al virus del Zika nacidos con la circunferencia de la cabeza (CC) normal. Estudio transversal. Participaron 31 niños en el estudio y se distribuyeron en dos grupos: 15 niños cuyas madres habían sido infectadas por el virus del Zika durante el embarazo nacieron con CC entre −1,9 y +2 puntajes Z ajustados por sexo y edad gestacional (grupo expuesto); y 16 controles seleccionados al azar pareados por sexo y edad, sin exposición prenatal conocida al virus del Zika (grupo no expuesto). La Alberta Infant Motor Scale (AIMS) se utilizó para evaluar el desarrollo motor grueso. No hubo diferencias significativas entre el grupo expuesto y el grupo no expuesto. A pesar de alentador, debemos destacar que la AIMS es una prueba de detección, que solo evalúa el desarrollo motor grueso, y que nuestra muestra fue pequeña. Por lo tanto, los niños expuestos al virus del Zika durante el embarazo se deben evaluar continuamente para que se identifiquen los diferentes aspectos de su desarrollo.

Resumo Objetivo: descrever um cluster da COVID-19 e as estratégias utilizadas para a contenção do vírus, num município do interior de Mato Grosso, Brasil. Métodos: estudo descritivo com dados dos registros documentais da investigação epidemiológica realizada em abril de 2020. Resultados: a introdução do vírus SARS-CoV-2 no município foi identificada a partir do cluster com cinco pessoas, sendo quatro sintomáticas e uma assintomática, consequente à importação pelos casos índices C01 e C02; além da transmissão intradomiciliar (C03 e C04), uma fisioterapeuta (C05) foi infectada por C02; com exceção do C04, todos apresentaram um quadro influenza símile e somente C02 necessitou de internação; quanto aos testes laboratoriais, todos foram sororreativos, e somente C01 foi RT-PCR positivo. Conclusão: a disseminação da COVID-19 foi contida pelo isolamento domiciliar, uma importante estratégia que deve ser adotada precocemente pelos municípios indenes na contenção da disseminação viral, e pelo teste sorológico, que detectou a infecção em assintomáticos.

Abstract Objective: to describe a COVID-19 cluster and the strategies used to contain the virus, in a municipality in the interior region of Mato Grosso state, Brazil. Methods: this is a descriptive study of documental records of an epidemiological investigation conducted in April 2020. Results: introduction of SARS-CoV-2 in the municipality was identified through a cluster comprised of five people, 4 were symptomatic and 1 was asymptomatic, after the virus was imported by index cases C01 and C02; in addition to household transmission (C03, C04), a physiotherapist (C05) was infected through contact with C02; with the exception of C04, all had an influenza-like symptoms and C02 required hospitalization; as for laboratory tests, all were seroreactive and C01 was RT-PCR positive. Conclusion: dissemination of COVID-19 was contained by effective home isolation, an important instrument that should be adopted early by unaffected municipalities to contain virus dissemination, as well as by serological testing that detected infection in asymptomatic patients.

Resumen Objetivo: describir un grupo de COVID-19 y las estrategias para contener el virus, en el interior de Mato Grosso, Brasil. Métodos: estudio descriptivo de los registros documentales de la investigación epidemiológica realizada en abril de 2020. Resultados: la introducción del SARS-CoV-2 en el municipio se identificó del grupo con cinco personas, cuatro sintomáticas y una asintomática, como consecuencia de la importación por los casos índices C01 y C02; además de la transmisión domiciliaria (C03 y C04), una fisioterapeuta (C05) infectada con C02; con excepción de C04, todos presentaron un cuadro influenza símile y solamente C02 requería hospitalización; en cuanto a las pruebas de laboratorio, todas fueron serorreactivas y sólo C01 fue RT-PCR positivo. Conclusión: la diseminación de COVID-19 fue contenida por el aislamiento domiciliario efectivo, un instrumento importante que los municipios indemnes deben adoptar con anticipación a la diseminación viral, y mediante la prueba serológica que detectó la infección en pacientes asintomáticos.

Resumo Objetivo: descrever um cluster da COVID-19 e as estratégias utilizadas para a contenção do vírus, num município do interior de Mato Grosso, Brasil. Métodos: estudo descritivo com dados dos registros documentais da investigação epidemiológica realizada em abril de 2020. Resultados: a introdução do vírus SARS-CoV-2 no município foi identificada a partir do cluster com cinco pessoas, sendo quatro sintomáticas e uma assintomática, consequente à importação pelos casos índices C01 e C02; além da transmissão intradomiciliar (C03 e C04), uma fisioterapeuta (C05) foi infectada por C02; com exceção do C04, todos apresentaram um quadro influenza símile e somente C02 necessitou de internação; quanto aos testes laboratoriais, todos foram sororreativos, e somente C01 foi RT-PCR positivo. Conclusão: a disseminação da COVID-19 foi contida pelo isolamento domiciliar, uma importante estratégia que deve ser adotada precocemente pelos municípios indenes na contenção da disseminação viral, e pelo teste sorológico, que detectou a infecção em assintomáticos.

Abstract Objective: to describe a COVID-19 cluster and the strategies used to contain the virus, in a municipality in the interior region of Mato Grosso state, Brazil. Methods: this is a descriptive study of documental records of an epidemiological investigation conducted in April 2020. Results: introduction of SARS-CoV-2 in the municipality was identified through a cluster comprised of five people, 4 were symptomatic and 1 was asymptomatic, after the virus was imported by index cases C01 and C02; in addition to household transmission (C03, C04), a physiotherapist (C05) was infected through contact with C02; with the exception of C04, all had an influenza-like symptoms and C02 required hospitalization; as for laboratory tests, all were seroreactive and C01 was RT-PCR positive. Conclusion: dissemination of COVID-19 was contained by effective home isolation, an important instrument that should be adopted early by unaffected municipalities to contain virus dissemination, as well as by serological testing that detected infection in asymptomatic patients.

Resumen Objetivo: describir un grupo de COVID-19 y las estrategias para contener el virus, en el interior de Mato Grosso, Brasil. Métodos: estudio descriptivo de los registros documentales de la investigación epidemiológica realizada en abril de 2020. Resultados: la introducción del SARS-CoV-2 en el municipio se identificó del grupo con cinco personas, cuatro sintomáticas y una asintomática, como consecuencia de la importación por los casos índices C01 y C02; además de la transmisión domiciliaria (C03 y C04), una fisioterapeuta (C05) infectada con C02; con excepción de C04, todos presentaron un cuadro influenza símile y solamente C02 requería hospitalización; en cuanto a las pruebas de laboratorio, todas fueron serorreactivas y sólo C01 fue RT-PCR positivo. Conclusión: la diseminación de COVID-19 fue contenida por el aislamiento domiciliario efectivo, un instrumento importante que los municipios indemnes deben adoptar con anticipación a la diseminación viral, y mediante la prueba serológica que detectó la infección en pacientes asintomáticos.

Resumo Objetivo: descrever as anomalias congênitas (ACs) entre nascidos vivos de mães residentes em Tangará da Serra, MT, Brasil, durante o período 2006-2016. Métodos: estudo descritivo, com dados do Sistema de Informações sobre Nascidos Vivos (Sinasc). Resultados: de 15.689 nascimentos, 77 foram registrados com ACs (4,9/1.000); houve incremento de 80,7% no registro de AC em 2016, representando 10,3/1.000 nascidos vivos, incluídos cinco casos de microcefalia; a prevalência de AC foi maior entre crianças de mulheres maiores de 35 anos de idade (razão de prevalência [RP] =1,91; intervalo de confiança [IC95%] 1,01;3,60), prematuros (RP=2,22; IC95% 1,26;3,92) e com baixo peso ao nascer (RP=3,21; IC95% 1,86;5,54). Conclusão: observou-se baixa prevalência de AC, possivelmente relacionada ao sub-registro no nascimento; o aumento observado em 2016 pode estar relacionado à epidemia de Zika como causa de microcefalia, e à maior atenção dos profissionais de saúde às ACs durante a emergência em Saúde Pública.

Abstract Objective: to describe congenital anomalies (CA) among live births of mothers resident in Tangará da Serra, MT, Brazil, during the period 2006-2016. Methods: this was a descriptive study, using Brazilian Live Birth Information System (SINASC) data. Results: out of 15,689 births, 77 were registered with CA (prevalence of 4.9/1,000); there was an 80.7% increase of recorded CA in 2016, accounting for 10.3/1,000 live births, including five cases of microcephaly; CA prevalence was higher among children born to women aged over 35 years (prevalence ratio [PR] =1.91; confidence interval [95%CI] 1.01;3.60), preterm (PR=2.22; 95%CI 1.26;3.92) and low birth weight infants (PR=3.21; 95%CI 1.86;5.54). Conclusion: low CA prevalence was found, possibly related to under-recording at birth; the increase observed in 2016 may be related to the Zika epidemic causing microcephaly, as well as greater attention by health professionals in relation to CA during this public health emergency.

Resumen Objetivo: describir las anomalías congénitas (AC) entre nacidos vivo de madres residentes en Tangara da Serra, MT, Brasil, en el periodo 2006-2016. Métodos: estudio descriptivo, con datos registrados en el Sistema de Informaciones sobre Nacidos Vivos (Sinasc). Resultados: de 15.689 nacimientos del período, 77 se registraron con AC (prevalencia de 4,9/1.000); hubo incremento del 80,7% de AC en 2016 con 10,3/1.000, inclusos cinco casos de micocefalia; las prevalencias fueron mayores entre hijos de mujeres mayores de 35 años de edad (razón de prevalencia [RP] =1,91; intervalo de confianza [IC95%] 1,01;3,60), prematuros (RP=2,22; IC95% 1,26;3,92) y con bajo peso al nacer (RP=3,21; IC95% 1,86;5,54). Conclusión: se observó baja prevalencia de AC, posiblemente relacionada a los sub-registros de nacimiento; el aumento observado en 2016 puede estar relacionado con la epidemia de Zika como causa de microcefalia, y a la mayor atención de los profesionales de salud en relación a las AC durante la emergencia en salud pública.

Resumo Objetivo: descrever as anomalias congênitas (ACs) entre nascidos vivos de mães residentes em Tangará da Serra, MT, Brasil, durante o período 2006-2016. Métodos: estudo descritivo, com dados do Sistema de Informações sobre Nascidos Vivos (Sinasc). Resultados: de 15.689 nascimentos, 77 foram registrados com ACs (4,9/1.000); houve incremento de 80,7% no registro de AC em 2016, representando 10,3/1.000 nascidos vivos, incluídos cinco casos de microcefalia; a prevalência de AC foi maior entre crianças de mulheres maiores de 35 anos de idade (razão de prevalência [RP] =1,91; intervalo de confiança [IC95%] 1,01;3,60), prematuros (RP=2,22; IC95% 1,26;3,92) e com baixo peso ao nascer (RP=3,21; IC95% 1,86;5,54). Conclusão: observou-se baixa prevalência de AC, possivelmente relacionada ao sub-registro no nascimento; o aumento observado em 2016 pode estar relacionado à epidemia de Zika como causa de microcefalia, e à maior atenção dos profissionais de saúde às ACs durante a emergência em Saúde Pública.

Abstract Objective: to describe congenital anomalies (CA) among live births of mothers resident in Tangará da Serra, MT, Brazil, during the period 2006-2016. Methods: this was a descriptive study, using Brazilian Live Birth Information System (SINASC) data. Results: out of 15,689 births, 77 were registered with CA (prevalence of 4.9/1,000); there was an 80.7% increase of recorded CA in 2016, accounting for 10.3/1,000 live births, including five cases of microcephaly; CA prevalence was higher among children born to women aged over 35 years (prevalence ratio [PR] =1.91; confidence interval [95%CI] 1.01;3.60), preterm (PR=2.22; 95%CI 1.26;3.92) and low birth weight infants (PR=3.21; 95%CI 1.86;5.54). Conclusion: low CA prevalence was found, possibly related to under-recording at birth; the increase observed in 2016 may be related to the Zika epidemic causing microcephaly, as well as greater attention by health professionals in relation to CA during this public health emergency.

Resumen Objetivo: describir las anomalías congénitas (AC) entre nacidos vivo de madres residentes en Tangara da Serra, MT, Brasil, en el periodo 2006-2016. Métodos: estudio descriptivo, con datos registrados en el Sistema de Informaciones sobre Nacidos Vivos (Sinasc). Resultados: de 15.689 nacimientos del período, 77 se registraron con AC (prevalencia de 4,9/1.000); hubo incremento del 80,7% de AC en 2016 con 10,3/1.000, inclusos cinco casos de micocefalia; las prevalencias fueron mayores entre hijos de mujeres mayores de 35 años de edad (razón de prevalencia [RP] =1,91; intervalo de confianza [IC95%] 1,01;3,60), prematuros (RP=2,22; IC95% 1,26;3,92) y con bajo peso al nacer (RP=3,21; IC95% 1,86;5,54). Conclusión: se observó baja prevalencia de AC, posiblemente relacionada a los sub-registros de nacimiento; el aumento observado en 2016 puede estar relacionado con la epidemia de Zika como causa de microcefalia, y a la mayor atención de los profesionales de salud en relación a las AC durante la emergencia en salud pública.