An outbreak of Rift Valley fever among peri-urban dairy cattle in northern Tanzania.
Trans R Soc Trop Med Hyg
; 116(11): 1082-1090, 2022 11 01.
Article
em En
| MEDLINE
| ID: mdl-36040309
ABSTRACT
BACKGROUND:
Human and animal cases of Rift Valley fever (RVF) are typically only reported during large outbreaks. The occurrence of RVF cases that go undetected by national surveillance systems in the period between these outbreaks is considered likely. The last reported cases of RVF in Tanzania occurred during a large outbreak in 2007-2008.METHODS:
Samples collected between 2017 and 2019 from livestock suffering abortion across northern Tanzania were retrospectively tested for evidence of RVF virus infection using serology and reverse transcription quantitative polymerase chain reaction (RT-qPCR).RESULTS:
A total of 14 RVF-associated cattle abortions were identified among dairy cattle in a peri-urban area surrounding the town of Moshi. RVF cases occurred from May to August 2018 and were considered to represent an undetected, small-scale RVF outbreak. Milk samples from 3 of 14 cases (21%) were found to be RT-qPCR positive. Genotyping revealed circulation of RVF viruses from two distinct lineages.CONCLUSIONS:
RVF outbreaks can occur more often in endemic settings than would be expected on the basis of detection by national surveillance. The occurrence of RVF cases among peri-urban dairy cattle and evidence for viral shedding in milk, also highlights potentially emerging risks for RVF associated with increasing urban and peri-urban livestock populations.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Febre do Vale de Rift
/
Vírus da Febre do Vale do Rift
Tipo de estudo:
Observational_studies
/
Risk_factors_studies
Limite:
Animals
/
Humans
País/Região como assunto:
Africa
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article