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Artigo
West Nile Vrus in the state of Cear?, northeast Brazil
Abstract: In June 2019, a horse with neurological disorder was diagnosed with West Nile virus (WNV) in Boa Viagem, a municipality in the state of Cear?, northeast Brazil. A multi-institutional task force coordinated by the Brazilian Ministry of Health was deployed to the area for case investigatio...
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Abstract: In June 2019, a horse with neurological disorder was diagnosed with West Nile virus (WNV)
in Boa Viagem, a municipality in the state of Cear?, northeast Brazil. A multi-institutional task force
coordinated by the Brazilian Ministry of Health was deployed to the area for case investigation. A
total of 513 biological samples from 78 humans, 157 domestic animals and 278 free-ranging wild
birds, as well as 853 adult mosquitoes of 22 species were tested for WNV by highly specific serological
and/or molecular tests. No active circulation of WNV was detected in vertebrates or mosquitoes by
molecular methods. Previous exposure to WNV was confirmed by seroconversion in domestic birds
and by the detection of specific neutralizing antibodies in 44% (11/25) of equids, 20.9% (14/67) of
domestic birds, 4.7% (13/278) of free-ranging wild birds, 2.6% (2/78) of humans, and 1.5% (1/65)
of small ruminants. Results indicate that not only equines but also humans and different species
of domestic animals and wild birds were locally exposed to WNV. The detection of neutralizing
antibodies for WNV in free-ranging individuals of abundant passerine species suggests that birds
commonly found in the region may have been involved as amplifying hosts in local transmission
cycles of WNV. |