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An alien in Marseille: investigations on a single Aedes aegypti mosquito likely introduced by a merchant ship from tropical Africa to Europe
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An alien in Marseille: investigations on a single Aedes aegypti mosquito likely introduced by a merchant ship from tropical Africa to Europe
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Journal Article
An alien in Marseille: investigations on a single Aedes aegypti mosquito likely introduced by a merchant ship from tropical Africa to Europe
2022
Overview
Control of invasive species relies partly on permanent surveillance at international points of entry. We report the exceptional trapping of one adult mosquito (Diptera: Culicidae) in the port of Marseille, France, in July 2018, during a routine survey conducted according to International Health Regulations. Morphological and molecular identification classified the specimen as a female Aedes ( Stegomyia ) aegypti (L.), vector of many arboviruses, absent from Europe and the Mediterranean rim since the 1950s. A world reference panel of approximately 23,000 genome-wide single nucleotide polymorphisms determined that the mosquito originated from Cameroon, west Africa. Cross-reference of this geographic location with boats traveling from Central Africa to Marseille during the trapping period suggests that the mosquito travelled within an identified merchant ship, a vehicles carrier connecting Douala, Cameroon to Marseille, France. This ship left Douala on June 25, 2018 and arrived 20 days later in Marseille on July 15. The mosquito was captured 350 m away from the dock. The interception of a propagule of an invasive species is a rare event that must be considered a priority to prevent its successful establishment. La lutte contre les espèces invasives repose en partie sur une surveillance permanente aux points d’entrée internationaux. Nous rapportons ici le piégeage exceptionnel d’un moustique adulte (Diptera: Culicidae) dans le port de Marseille, France, en juillet 2018, au cours d’une enquête de routine menée selon les recommandations du Règlement Sanitaire International. L’identification morphologique et moléculaire a désigné ce spécimen comme étant une femelle d’ Aedes ( Stegomyia ) aegypti (L.), vecteur de nombreux arbovirus, absent d’Europe et du pourtour Méditerranéen depuis les années 1950. Une base de référence mondiale du polymorphisme des nucléotides individuels pour ~23 000 génomes complets a permis de déterminer que ce moustique était originaire du Cameroun. Le croisement de cette information de localisation géographique avec celle de la circulation des bateaux entre l’Afrique Centrale et Marseille au cours de la période de piégeage suggère que le moustique a voyagé à l’intérieur d’un navire de commerce identifié, un transporteur de véhicules reliant Douala (Cameroun) à Marseille (France). Ce navire a quitté Douala le 25 juin 2018 pour arriver à Marseille 20 jours plus tard, le 15 juillet 2018. Le moustique a été capturé à 350 mètres du dock. L’interception d’un propagule d’une espèce invasive est un évènement rare qui doit être considéré de façon prioritaire afin d’empêcher la réussite de son installation.
Publisher
EDP Sciences
