The Re-Emergence of Rift Valley Fever in Mananjary District, Madagascar in 2021: A Call for Action - Archive ouverte HAL Access content directly
Journal Articles Pathogens Year : 2024

The Re-Emergence of Rift Valley Fever in Mananjary District, Madagascar in 2021: A Call for Action

Soa Fy Andriamandimby
Laurence Randrianasolo
Michael Luciano Tantely
Romain Girod
Philippe Dussart
Vincent Lacoste

Abstract

An epizootic of rift valley fever (RVF) was suspected on 21 February 2021 in various districts of Madagascar, with a lab confirmation on 1 April 2021. A cross-sectional survey aiming to detect cases of RVF in humans and to study the circulation of rift valley fever virus (RVFV) in animals was conducted from 22 April to 4 May 2021 in the district of Mananjary. Blood samples from cattle and humans were tested using serological and molecular techniques. In cattle, the circulation of RVFV was confirmed between 5 February and 4 May 2021. The positivity rates of anti-RVFV IgG and IgM were 60% and 40%, respectively. In humans, the circulation of RVFV was observed from 1 April to 5 May 2021. The positivity rate of RVFV was estimated to be 11.7% by combining the results of the molecular and serological approaches. Of the 103 individuals who agreed to participate in the survey, 3 were determined to be positive by RT-PCR, and 10 had anti-RVFV IgM. Among them, one was positive for both. Given that previous studies have reported the circulation of RVFV during inter-epidemic periods and the occurrence of outbreaks due to imported RVFV in Madagascar, our findings suggest the importance of strengthening RVF surveillance from a “One Health” perspective by conducting syndromic and risk-based surveillance at the national and regional levels.
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hal-04553469 , version 1 (23-04-2024)

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Aina Nirina Harimanana, Soa Fy Andriamandimby, Dany Bakoly Ranoaritiana, Laurence Randrianasolo, Judickaelle Irinantenaina, et al.. The Re-Emergence of Rift Valley Fever in Mananjary District, Madagascar in 2021: A Call for Action. Pathogens, 2024, 13 (3), pp.257. ⟨10.3390/pathogens13030257⟩. ⟨hal-04553469⟩
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