Fontenille Didier, Diallo M., Thonnon J. (1998). La transmission verticale du virus amaril et ses conséquences. In :
Séminaire international sur la fièvre jaune en Afrique : actes. Lyon : Fondation Marcel Mérieux (FRA), p. 34-36. (Collection Fondation Marcel Mérieux). La Fièvre Jaune en Afrique : Séminaire International, Dakar (SEN), 1998/06/25-27.
Titre du document
La transmission verticale du virus amaril et ses conséquences
Année de publication
1998
Type de document
Colloque
Auteurs
Fontenille Didier, Diallo M., Thonnon J.
In
Séminaire international sur la fièvre jaune en Afrique : actes
Source
Lyon : Fondation Marcel Mérieux (FRA), 1998,
p. 34-36 (Collection Fondation Marcel Mérieux).
Colloque
La Fièvre Jaune en Afrique : Séminaire International, Dakar (SEN), 1998/06/25-27
In 1903, a few years after the discovery of the transmission of yellow fever, Marchoux and Simond demonstrated experimentally that the yellow fever virus could be transmitted from an infected female Aedes aegypti mosquito to her offspring. In spite of numerous attempts, it was not until 1979 that Aitken confirmed these experimental results. It also has been demonstrated experimentally that both Ae. mascarensis and Haemagogus equinus females can transmit the virus to their offspring. Isolation of the virus from Ae. furcifer-taylori males that had been captured in 1977 in Senegal suggested that this transmission occurred in nature, but it was not until 1995 that vertical transmission within wild Ae. aegypti, the mosquitoes responsible for the urban transmission, was observed. Vertical transmission in nature of the yellow fever virus has two important epidemiologic consequences : the virus may maintain itself from one rainy season to the next, in the resting eggs of Aedes (Ae. aegypti for urban cycles, Aedes furcifer, Ae. taylori, Ae. luteocephalus for sylvatic cycles in West Africa). Such was the case in Senegal, where the yellow fever virus remained in the epidemic region of Koungheul in 1995, only to reappear the following year as the cause of an epidemic in a neighbouring zone, Kaffrine, where there had not been a vaccination campaign. Furthermore, the virus is re-isolated frequently in the forests of Western Senegal, in the years following an epizootic outbreak among monkeys. The Aedes females contaminated by vertical transmission are infective much earlier, after their first blood meal a few days after hatching, without awaiting the completion of the classic extrinsic viral cycle of from 8 to 12 days that follows engorgement on a viremic host. The number of infected blood meals and the proportion of females liable to transmit are likewise increased... (D'après résumé d'auteur)
Plan de classement
Epidémiologie des arbovirus [052CULARB03]
Descripteurs
FIEVRE JAUNE ; VIRUS ; VECTEUR ; MOUSTIQUE ; TRANSMISSION ; EPIDEMIE ; TRANSMISSION VERTICALE
Description Géographique
SENEGAL ; AFRIQUE
Localisation
Fonds IRD [F B010019371] ;
Montpellier (Centre IRD)
Identifiant IRD
fdi:010019371
