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Laboratoire d'Ecologie Générale, Museum National d'Histoire Naturelle, Brunoy, France
Laboratoire d'Ecologie Animale, Faculté des Sciences, 25035 Besançon, France
Institut Pasteur de Madagascar, B.P. 1274, Antananarivo, Madagascar
In previous serological surveys of lemurs in Madagascar, antibodies against flaviviruses were frequently detected. To examine the epidemiological role of Lemur fulvus, experimental infections with yellow fever (YF) virus and West Nile (WN) virus were performed. YF and WN infections were clinically unapparent. A 3 to 4-day-long viremia, with moderate levels was observed with YF virus. WN virus, especially the strain isolated in Madagascar, provoked a 4 to 6-day-long viremia sufficient to infect Aedes aegypti. In all experiments, the antibody response was studied during the following weeks by 3 methods. The results led to the conclusion that Malagasy lemurs could act as amplifying hosts for WN virus present in Madagascar, and as hosts for YF virus if it were introduced on the island. The epidemiological role of these primates is discussed according to their ecology and their contact with potential mosquito vectors in forest areas of Madagascar.
Accepted for publication October 22, 1984.
* These investigations were supported by the Institut National de la Sante et de la Recherche Medicale, contract C.R.L. No. 79.4.440.8.
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