17 February 2024 The prevalence of dengue serovirus in Madagascar was 6.5% (2011-2013).

February 17, 2024

It has been shown that the virus dengue circulates in Madagascar. Although patterns of its circulation in the country remain poorly documented. It was not isolated or detected in serological studies until the late 1980s.

In 2006 DENV1 was discovered in Toamasina (east coast of Madagascar) during an epidemic of febrile diseases and have been shown to circulate in various regions of the east coast.

Active circulation of dengue fever detected in cities Toamasina, Antsiranana (northern coast of Madagascar) and Nosy Be (western island of Madagascar) in 2012.

A recent study found the overall seroprevalence of dengue virus (DENV) in Madagascar to be 6.5%, with regional variations. The highest prevalence was observed in Nosy Be (north, 48.3%) and Toamasina (east coast, 43.3%). In univariate logistic regression analysis, no significant association was found with age, gender, or distance to health centers.

Of the positive individuals, 60.0% were seropositive for one serotype, highlighting the prevalence of DENV1 at 85.5%. The spatial distribution was similar for all serotypes.

Since 2007, the Pasteur Institute of Madagascar (IPM), in collaboration with Madagascar’s Ministry of Health, has been coordinating a network of sentinel health centers (CSHs) that monitor epidemic diseases (malaria, influenza and arboviruses). Thanks to this SHC, dengue-like syndromes accounted for 12.3% of fever cases in 2008.

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Local risks Madagascar