West Nile Fever,
Information received on 06/06/2018 from Dr Figueiredo Marques Guilherme Henrique , Director, Departamento de Saúde Animal , Ministério da Agricultura, Pecuaria e Abastecimento , Brasilia, Brazil
Report type Immediate notification
Date of start of the event 25/04/2018
Date of confirmation of the event 04/06/2018
Report date 06/06/2018
Date submitted to OIE 06/06/2018
Reason for notification First occurrence of a listed disease
Manifestation of disease Clinical disease
Causal agent West Nile fever virus
Nature of diagnosis Clinical, Laboratory (advanced)
This event pertains to a defined zone within the country
Related reports Immediate notification (06/06/2018)
Follow-up report No. 1 (22/06/2018)
Follow-up report No. 2 (06/07/2018)
New outbreaks (1)
Outbreak 1 ( 32049060046) São Mateus, Espirito Santo
Date of start of the outbreak 25/04/2018
Outbreak status Resolved (31/10/2018)
Epidemiological unit Farm
Affected animals
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Equidae 3 1 0 1 0
Affected population An adult equine showing motion incoordination and lateral decubitus has been euthanized for the purposes of sampling. The other animals of the property did not show clinical signs.
Summary of outbreaks Total outbreaks: 1
Total animals affected
Species Susceptible Cases Deaths Killed and disposed of Slaughtered
Equidae 3 1 0 1 0
Outbreak statistics
Species Apparent morbidity rate Apparent mortality rate Apparent case fatality rate Proportion susceptible animals lost*
Equidae 33.33% 0.00% 0.00% 33.33%
*Removed from the susceptible population through death, destruction and/or slaughter
Source of the outbreak(s) or origin of infection
  • Vectors
Epidemiological comments The official Veterinary services are investigating notifications of mortality in equines associated with neurological signs in the north-east region of the State of Espirito Santo. Initially, the samples have been tested in order to detect rabies in herbivores. Because of negative results, the samples were sent to the Evandro Chagas Institute, Reference national laboratory of the Ministry of Health, to investigate arbovirosis. Complementary laboratory and epidemiological investigations are on-going, in collaboration with the national and local human health services, as well as alert communication actions to report suspicious cases.
Control measures
Measures applied
  • Surveillance within containment and/or protection zone
  • Vaccination permitted (if a vaccine exists)
  • No treatment of affected animals
Measures to be applied
  • No other measures
Diagnostic test results
Laboratory name and type Species Test Test date Result
Evandro Chagas Institute (National laboratory) Equidae real-time reverse transcriptase/polymerase chain reaction (RRT-PCR) 04/06/2018 Positive
Animal virology laboratory, Minas Gerais Federal University (Regional Laboratory) Equidae nested RT-PCR 04/06/2018 Positive
Future Reporting
The event is continuing. Weekly follow-up reports will be submitted.
Map of outbreak locations