Epizootics, Yellow Fever, Ecological Corridors, Epidemiology

Yellow Fever (YF) is a serious acute disease and its surveillance is a complex activity that involves different components of health surveillance. The objective of this study was to describe the monitoring of health surveillance actions associated with the viral circulation of Yellow Fever in Non-Human Primates (NHP) found naturally dead in the municipalities of the state of Pernambuco, Brazil. A descriptive epidemiological study was carried out based on secondary data collected from the official SINAN NET notification system. Between 2019 and 2021, 286 NHP deaths were reported to the Arbovirus Surveillance Management of the Pernambuco Health Department, involving 327 NHP, of which 18.5% were not entered into SINAN NET. To date, no PNH has been diagnosed with the YF virus. According to the information on the occurrence of epizootics in PNH, in a timely manner, the three years presented percentages below 50%. The ecological corridors and possible entry points for the yellow fever virus in Pernambuco were also defined in this study, and vaccination strategies were outlined population from the possible entry points for the virus in the State of Pernambuco, through the municipalities of the III and V Health Regions. Based on the partial data, it is possible to conclude that there are a number of conditioning and determining factors that can lead to the late detection of YF viral circulation in the state, among them the low sensitivity of the municipalities regarding the monitoring of epizootics, since only 22.8% of municipalities in the state reported occurrences of events and the low percentage of communications of events in a timely period (after 24 hours of the occurrence of the event). Late knowledge of epizootics in PNH can have a direct impact on the health sector, preventing promotion, protection and control measures from being carried out in a timely manner, becoming a serious aggravating factor in the failure of surveillance. As surveillance measures, it is suggested to capture insects in areas to identify species of mosquitoes potentially vectors of YF in areas where PNH epizootics occur and to carry out research for the virus in these vector species.