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© Research
Publication : Archives de l'Institut Pasteur de Madagascar

[The plague at the Tsenabe Isotry market in Antananarivo: a complex epidemiologic situation].

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Archives de l'Institut Pasteur de Madagascar - 01 Jan 2001

Raharimanga V, Ratsitorahina M, Migliani R, Rosso ML, Rahalison L, Chanteau S,

Link to Pubmed [PMID] – 12471741

Arch Inst Pasteur Madagascar 2001 ; 67(1-2): 19-20

The transmission of Yersinia pestis is intense among rats in the wholesale market Tsenabe Isotry in the capital Antananarivo (anti-F1 sero-prevalence 80%, flea index 8.4 for a cut-off risk index of > 1). However, the number of plague-suspected (not laboratory confirmed) human cases has only been 3 in this district during a four years period from 1995 to 1999. A seroepidemiological survey among the market vendors was undertaken in June 1999 to test the hypothesis that the low incidence of human plague is due to acquired immunity. In addition, surveillance of the rat and the flea populations in the market was carried out. Only 3 (3.2%) of 95 screened vendors were anti-F1 IgG positive, whereas the markers of plague transmission among rodents and fleas were still high. This result suggests that the low incidence of human plague was not due to acquired immunity but to other factors such as the limited contact between humans and the rat fleas because of the abundance of rats, the absence of epizootic due to the resistance of rats in the capital and a particular behaviour of the predominant rat Rattus norvegicus.

https://pubmed.ncbi.nlm.nih.gov/12471741