Resumo Objetivo Avaliar a proporção de pessoas idosas não vacinadas e os motivos que interferem na imunização contra influenza em localidades rurais ribeirinhas, discutindo as potenciais implicações na vacinação contra a infecção por SARS-CoV-2. Método Inquérito epidemiológico de base domiciliar realizado em 38 localidades rurais ribeirinhas de Manaus (AM), Brasil, assistidas por uma Unidade Básica de Saúde Fluvial. Os participantes responderam a um questionário que investigou condições de vida, saúde e acesso aos serviços de saúde. Para este estudo foram avaliados os desfechos relacionados à imunização contra a Influenza nos últimos 12 meses e o principal motivo alegado para a não vacinação. Foi realizada análise descritiva dos dados, seguida por análise de regressão logística para identificar fatores associados à não vacinação. Resultados Das 102 pessoas idosas incluídas no estudo, 28 (27,5%) referiram não vacinação contra a Influenza no ano anterior. Os principais motivos foram a falta de informação sobre a vacinação (60,7%) e barreiras de acesso aos serviços de saúde (28,6%). Foi identificada maior chance de não vacinação entre aqueles que não consultaram o médico no último ano (RC=4,18; IC95%=1,57-11,11) e com maior renda domiciliar (RC=1,08; IC95%=1,02-1,14). Conclusão Verificou-se elevada proporção de pessoas idosas autorreferindo não imunização contra Influenza. Os motivos identificados para a não vacinação podem também representar barreiras à vacinação desse grupo populacional contra a covid-19. Dessa forma, faz-se necessário adequar o planejamento da vacinação em contextos rurais ribeirinhos, desenvolvendo estratégias mais contextualizadas para garantia de cobertura a essa população com maior vulnerabilidade aos efeitos de doenças respiratórias.

Abstract Objective To evaluate the proportion of unvaccinated older adults and the reasons that interfere with immunization against Influenza in rural riverside locations, discussing the potential implications on vaccination against SARS-CoV-2 infection. Method Household-based survey conducted in 38 rural riverside locations in Manaus, Amazonas, Brazil, covered by a primary care Fluvial Health Unit. Participants answered a questionnaire that investigated living conditions, health status and access to health services. In this study, the outcomes related to immunization against Influenza in the last 12 months and the main reported reason for non-vaccination were evaluated. Descriptive data analysis was performed, followed by logistic regression to identify factors associated with non-vaccination. Results Of the 102 older adults included in the study, 28 (27.5%) reported not vaccinating against Influenza in the previous year. The main reasons were lack of information about vaccination (60.7%) and barriers to accessing health services (28.6%). An increased chance of non-vaccination was identified among those who did not see a doctor in the last year (OR=4.18; 95%CI=1.57-11.11) and those with higher household income (OR=1.08; 95%CI= 1.02-1.14). Conclusion A high proportion of older adults reporting no immunization against Influenza was identified. The reasons for non-vaccination may also represent barriers to the vaccination of this population group against COVID-19. Thus, it is necessary to improve the vaccination planning in rural riverside contexts, developing more contextualized strategies to assure coverage for this population, more vulnerable to the effects of respiratory diseases.

INTRODUCTION: In the State of Amazonas, particularly in the capital Manaus, meningitis has affected populations of different cultures and social strata over the years. Bacterial meningitis is caused by several different species and represents a major issue of public health importance. The present study reports the meningitis case numbers with different etiologies in Amazonas from January 1976 to December 2012. METHODS: Since the 1970s, the (currently named) Tropical Medicine Foundation of Doutor Heitor Vieira Dourado [Fundação de Medicina Tropical Doutor Heitor Vieira Dourado (FMT-HVD)] has remained a reference center in Amazonas for the treatment of meningitis through the diagnosis and notification of cases and the confirmation of such cases using specific laboratory tests. RESULTS: The foundation has achieved coverage of over 90% of the state medical records for many years. Between 1990 and 2012, meningitis cases caused by Haemophilus influenzae decreased with the introduction of the H. influenzae vaccine. Meningococcal disease previously had a higher frequency of serogroup B disease, but starting in 2008, the detection of serogroup C increased gradually and has outpaced the detection of serogroup B. Recently, surveillance has improved the etiological definition of viral meningitis at FMT-HVD, with enteroviruses, Epstein-Barr virus (EBV) and varicella zoster virus (VZV) prevailing in this group of pathogens. With the advent of acquired immunodeficiency syndrome (AIDS), cryptococcal meningitis has become an important disease in Amazonas. Additionally, infectious meningitis is an important burden in the State of Amazonas. CONCLUSIONS: Changes in the epidemiological profile for the different etiology-defined cases are the result of continuous epidemiological surveillance and laboratory capacity improvements and control measures, such as Haemophilus influenzae vaccination.

Dengue fever is the world's most important viral hemorrhagic fever disease, the most geographically wide-spread of the arthropod-born viruses, and it causes a wide clinical spectrum of disease. We report a case of dengue hemorrhagic fever complicated by acute hepatitis. The initial picture of classical dengue fever was followed by painful liver enlargement, vomiting, hematemesis, epistaxis and diarrhea. Severe liver injury was detected by laboratory investigation, according to a syndromic surveillance protocol, expressed in a self-limiting pattern and the patient had a complete recovery. The serological tests for hepatitis and yellow fever viruses were negative. MAC-ELISA for dengue was positive.

Dois casos de lactentes atendidos na Fundação de Medicina Tropical do Amazonas, com síndrome febril exantemática aguda, extravasamento capilar e manifestações hemorrágicas de pequena magnitude, caracterizando quadro de febre hemorrágica do dengue. O diagnóstico etiológico foi confirmado pelo MAC-ELISA e pelo ELISA de inibição para IgG, realizados nos lactentes e nas respectivas mães.

Two cases of infants assisted at the Tropical Medicine Foundation of Amazonas with febrile exanthematic syndrome and mild hemorrhagic manifestations, defining a picture of dengue hemorrhagic fever. The etiologic diagnose was confirmed by the MAC-ELISA and the Inhibition - ELISA, performed in both infants and respective mothers.