Retrospective Investigation in Horses with Encephalitis Reveals Unnoticed Circulation of West Nile Virus in Brazil
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Universidade Federal de Minas Gerais
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Retrospective Investigation in Horses with Encephalitis Reveals Unnoticed Circulation of West Nile Virus in Brazil
by Hegger Fritsch 1,†,Felicidade Mota Pereira 2,†,Erica Azevedo Costa 1,†ORCID,Vagner Fonseca 3,†ORCID,Stephane Tosta 1,†,Joilson Xavier 1ORCID,Flavia Levy 4,Carla de Oliveira 4,Gabriela Menezes 2,Jaqueline Lima 2,Lenisa Santos 2,Luciana Silva 2,Vanessa Nardy 2,Marcela Kelly Gómez Astete 2ORCID,Beatriz Senra Álvares da Silva Santos 1ORCID,Nágila Rocha Aguiar 1,Maria Isabel Maldonado Coelho Guedes 1ORCID,Guilherme Canhestro de Faria 5,Ronaldo Furtini 5,Safira Rachel Milanez Drumond 5,add Show full author list
1
Laboratorio de Pesquisa em Virologia Animal, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil
2
Laboratório Central de Saúde Pública Prof Goncalo Moniz, Salvador 41745-900, Brazil
3
Organização Pan-Americana de Saúde/Organização Mundial de Saúde, Brasilia 37650-000, Brazil
4
Laboratorio de Flavivirus, lnstituto Oswaldo Cruz/Fundação Oswaldo Cruz, Rio de Janeiro 21040-360, Brazil
5
Laboratório de Saúde Animal, Instituto Mineiro de Agropecuária, Belo Horizonte 30110-005, Brazil
6
Secretary of Health of the State of Bahia (SESAB), Salvador 40301-110, Brazil
7
Coordenação Geral dos Laboratórios de Saúde Pública, Secretaria de Vigilância em Saúde-Brazil, Brasília 70719-040, Brazil
8
Coordenação Geral das Arboviroses, Secretaria de Vigilância em Saúde (CGARB/SVS-MS), Brasilia 37650-000, Brazil
9
Fundação Oswaldo Cruz, Bio-Manguinhos, Rio de Janeiro 21040-360, Brazil
10
Department of Science and Technology for Humans and the Environment, University of Campus Bio-Medico, 00128 Rome, Italy
*
Authors to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Viruses 2022, 14(7), 1540; https://doi.org/10.3390/v14071540
Submission received: 17 June 2022 / Revised: 10 July 2022 / Accepted: 11 July 2022 / Published: 14 July 2022
(This article belongs to the Special Issue Usutu, West Nile and Tickborne Encephalitis Viruses)
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Abstract
During these past years, several studies have provided serological evidence regarding the circulation of West Nile virus (WNV) in Brazil. Despite some reports, much is still unknown regarding the genomic diversity and transmission dynamics of this virus in the country. Recently, genomic monitoring activities in horses revealed the circulation of WNV in several Brazilian regions. These findings on the paucity of genomic data reinforce the need for prompt investigation of WNV infection in horses, which may precede human cases of encephalitis in Brazil. Thus, in this study, we retrospectively screened 54 suspicious WNV samples collected between 2017 and 2020 from the spinal cord and brain of horses with encephalitis and generated three new WNV genomes from the Ceará and Bahia states, located in the northeastern region of Brazil. The Bayesian reconstruction revealed that at least two independent introduction events occurred in Brazil. The first introduction event appears to be likely related to the North American outbreak, and was estimated to have occurred in March 2013.The second introduction event appears to have occurred in September 2017 and appears to be likely related to the South American outbreak. Together, our results reinforce the importance of increasing the priority of WNV genomic monitoring in equines with encephalitis in order to track the dispersion of this emerging pathogen through the country.
Abstract
Assunto
Genoma, Brasil, Equino, Vírus do Nilo Ocidental
Palavras-chave
WNV, Nanopore sequencing, Genomic monitoring, Brazil
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https://www.mdpi.com/1999-4915/14/7/1540