American tegumentary leishmaniasis (ATL) is one of the most important but neglected infectious diseases, and can cause severe deformities. ATL incidence remains high in forest regions, such as in the Amazonas State, Brazil. However, differences within the State and over time have been observed, since infection patterns are not homogeneous, and these aspects need to be clarified. This study aimed to identify the epidemiological profile of ATL and its spatial and temporal distribution in the Brazilian Amazon, from 2010 to 2014. Data were extracted from the Information System for Notifiable Diseases, which descriptively evaluates the incidence rate, as well as the temporal and spatial distribution of the disease. The highest prevalence of ATL was found in men and in the age group of 20-40 years. Approximately 95% of the cases were of cutaneous ATL and they were identified through direct examination. The spatial analysis has shown that ATL was widely distributed, both in rural and urban areas, and more concentrated in the Southern part of the State. Moreover, although there was an expansion in the spatial distribution and an increasing incidence of ATL in Amazonas, the epidemiological profile remained unchanged, suggesting that other factors must be responsible for its widespread distribution and increasing incidence.

In Brazil, approximately 99% of malaria cases are concentrated in the Amazon region. An acute febrile infectious disease, malaria is closely related to climatic and hydrological factors. Environmental variables such as rainfall, flow, level, and color of rivers, the latter associated with the suspended sediment concentration, are important factors that can affect the dynamics of the incidence of some infectious diseases, including malaria. This study explores the possibility that malaria incidence is influenced by precipitation, fluctuations in river levels, and suspended sediment concentration. The four studied municipalities are located in two Brazilian states (Amazonas and Pará) on the banks of rivers with different hydrological characteristics. The results suggest that precipitation and river level fluctuations modulate the seasonal pattern of the disease and evidence the existence of delayed effects of river floods on malaria incidence. The seasonality of the disease has a different influence in each municipality studied. However, municipalities close to rivers with the same characteristic color of waters (as a function of the concentration of suspended sediments) have similar responses to the disease.

Resumo A região amazônica abrange um território heterogêneo com características geográficas específicas, abrigando diversas populações vulnerabilizadas, o que exige dos serviços de saúde o desenvolvimento de habilidades e inovações. Entretanto, as respostas a esses desafios se tornam ainda mais distantes diante de uma lógica mercadológica, que tende a invisibilizar diferenças e privilegiar determinados territórios. Nesse cenário, este estudo analisou a implementação de uma Unidade Básica de Saúde Fluvial, buscando compreender como estão incluídas as necessidades e singularidades do meio rural ribeirinho no planejamento e execução dos serviços de saúde. Para isso, foram realizadas entrevistas com gestores e profissionais, além da observação do cotidiano dos serviços de saúde. Os resultados demonstram que a previsão de serviços, com formatos e recursos específicos para as áreas fluviais amazônicas, foi uma oportunidade para que as particularidades da região fossem evidenciadas e que mais recursos, inclusive financeiros, fossem previstos para essas localidades. No entanto, evidenciou-se também que os serviços ofertados continuam sendo planejados de forma hierárquica, além de serem organizados e executados visando realidades urbanas, o que aponta a necessidade de adaptações.

Sporotrichosis is an emerging fungal infection that has been causing concern in Brazil since the late 1990s and is the most prevalent and globally distributed among implantation mycoses. In Brazil, the increase in sporotrichosis cases is strongly associated with infections in cats. This study aimed to identify the epidemiological profile and expansion of sporotrichosis in the city of Manaus, Amazonas State, Brazil, based on cases reported from 2020 to 2023. Secondary data from confirmed sporotrichosis cases during this period in Manaus were employed. Human data were extracted from the Brazilian Information System for Notificable Diseases, the Manaus Municipal Health Department, and the RedCap database of the Amazonas Health Surveillance Foundation - Registry of Positive Cases. The animal data were extracted from the spreadsheet of the Dr. Carlos Durand Zoonoses Control Center in Manaus. Data analysis was performed using the RStudio software for the spatial distribution of cases in the QGIS program, which was used to define the areas with the highest absolute number of cases. From August 2020 to December 2023, 4,301 sporotrichosis cases were confirmed, including 3,403 animal cases (of which 99.6% involved cats) and 898 human cases. From 2022 to 2023, the number of human cases doubled and animal cases quadrupled, with cases reported across all areas of Manaus. The expansion of sporotrichosis was observed over a two-year period for nearly the entire area of Manaus, with a significant increase in cases and an association between animal and human cases.

Trypanosomatids are widespread and cause diseases - such as trypanosomiasis, sleeping sickness, Chagas disease, and cutaneous and visceral leishmaniasis - in animals and humans. These diseases occur in both rural and urban regions due to unplanned growth and deforestation. Thus, wild and synanthropic reservoir hosts living in residential areas are risk factors. We aimed to evaluate the diversity of small mammals (rodents and marsupials), and the occurrence of trypanosomatids, especially Leishmania, in the rural settlement of Presidente Figueiredo, Amazonas. Animals were collected using Sherman, Tomahawk, and Pitfall traps along 16 trails in four landscapes: continuous forest, forest with planting, planting, and peridomiciliar. Leishmania sp. was detected in liver samples by polymerase chain reaction targeting kDNA. Diversity was higher in forests with planting and lower around residences. In total, 135 mammals (81 rodents and 54 marsupials covering 14 genera) were captured. Rodents presented infection rates (IR) of 74% and marsupials of 48%. Rodents in domicile landscapes presented a higher IR (92.9%), while marsupials showed a higher IR in forests (53.3%). The results suggest high prevalence of trypanosomatids across 12 mammalian genera possibly involved as reservoir hosts in the enzootic transmission of leishmaniasis in the Amazon’s rural, peridomiciliar landscape.

Background: Malaria is transmitted by different Anopheles species. In Brazil, the disease is concentrated in the Amazon region. Rivers play an important role in the life cycle of malaria since the vector reproduces in aquatic environments. The waters of the rivers in the Amazon have distinct chemical characteristics, which affect the colour of the water and therefore, the study analysed whether the colour of the waters of the rivers have an on influence the distribution of malaria. The goal of the study was to correlate the different colourations of the water (black, white and mixed water) and the malaria incidence in 50 municipalities of the Amazonas state, Brazil, and then test hypotheses about the characteristics of the colour of the rivers and disease incidence. Methods: This study was conducted for a period of seventeen years (2003–2019) in 50 municipalities in the state of Amazonas, Brazil. A conditionally Gaussian dynamic linear model was developed to analyse the association of malaria incidence and three types of river colour: white, black and mixed. Results: The analyses indicate that the distribution of malaria is related to the colouration of the rivers. The results showed that places located near black-water rivers have a higher malaria incidence when compared to places on the banks of white-water rivers. Conclusions: Historically, the hydrological regime has played an important role in the dynamics of malaria in the Amazon, but little is known about the relationship between river colours and the incidence of the disease. This research was carried out in a region with hydrographic characteristics that were heterogeneous enough to allow an analysis that contrasted different colours of the rivers and covered almost the whole of the state of Amazonas. The results help to identify the places with the highest risk of malaria transmission and it is believed that they will be able to contribute to more precise planning of actions aimed at controlling the disease in the region.