Issue |
Parasite
Volume 10, Number 1, March 2003
|
|
---|---|---|
Page(s) | 3 - 8 | |
DOI | https://doi.org/10.1051/parasite/2003101p3 | |
Published online | 27 August 2014 |
Mémoire
Black flies (Diptera : Simuliidae) attracted to humans and water buffalos and natural infections with filarial larvae, probably Onchocerca sp., in northern Thailand
Simulies attirées par l'homme et le buffle domestique en Thailande septentrionale et infestations naturelles par des larves de filaires, probablement d’Onchocerca sp.
1
Department of Infectious Diseases & Research Center for Asian and Caribbean Diseases. Oita Medical University, Hasama, Oita. 879-5593, Japan.
2
Department of Parasitology, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand.
3
Parasitologie comparée et Modèles expérimentaux 0307, associé à l'INSERM (U567), et École pratique des Hautes Études, Muséum National d'Histoire Naturelle. 61 . rue Buffon, 75231 Paris Cedex 05, France.
* Correspondence : H. Takaoka. E-mail : takaoka@oita-med.ac.jp
Received:
2
September
2002
Accepted:
21
November
2002
Several Simulium species were investigated as to their biting habits and natural infections with filarial larvae at Ban Pan Fan, Chiang Mai Province, in northern Thailand. Female adults flies landing on or flighting around a human and a water buffalo were collected during the daytime from 06.00 to 19.00 hours on 22 June 2001. As a result, 217 S. nodosum, 86 S. asakoae and two S. nigrogilvum were obtained from a human attractant, and 416 S. nodosum, 25 S. nakhonense, 16 S. asakoae, four 5. fenestratum and two S. nigrogilvum, from a water buffalo. The blood-feeding was confirmed only for S. nodosum and S. nigrogilvum on humans, and for S. nodosum and S. nakhonense on water buffalos. Dissections of these simuliids showed that S. nodosum was naturally infected with developing filarial larvae. Two types of microfilariae were distinguished but only one type of infective larvae. These larvae resembled Onchocerca suzukii, a parasite from a wild Japanese bovid, suggesting that an unknown Onchocerca species from ruminants was transmitted in Thailand. Infection rates with all stages of larvae and third-stage larvae were 2.3 % (14/608) and 1 .0 % (6/608), respectively. This is the first report of natural infections of black flies with Onchocerca larvae in Southeast Asia, and the involved black fly species is shown to be not only anthropophilic but also zoophilic in this region.
Résumé
Identification et préférence trophique des espèces de simulies capturées à Ban Pan Fan (Province de Chiang Mai) et étude de de leur infestation naturelle par des larves de Maires. Les femelles des simulies volant autour ou se posant sur l'homme ou sur un buffle domestique ont été capturées le 22 juin 2001 de 6 h à 19 h. 217 S. nodosum, 86 S. asakoae et deux S. nigrogilvum ont été obtenues avec l'appât humain ; 416 S. nodosum, 25 S. nakhonense, 16 S. asakoae, four S. fenestratum et deux S. nigrogilvum avec l'appât buffle. Quelques simulies se sont gorgées : S. nigrogilvum sur l'homme, S . nakhonense sur le buffle et S. nodosum sur les deux. Chez S. nodosum, deux types de microfilaires (2,3 % = 14/608) et un type de larve infestante (1 % = 6 / 608) ont été trouvés. Les larves infestantes ressemblent à celles d'Onchocerca suzukii, qui est parasite d'un Bovidae sauvage du Japon. Cela suggère l'existence d'une espèce encore inconnue en Asie du Sud-est, et on montre que la simulie incriminée est non seulement anthropophile, mais aussi zoophile dans cette région.
Key words: black fly / filaria / natural infection / Onchocerca / Simuliidae / Thailand
Mots clés : simulie / filaire / infection naturelle / Onchocerca / Thaïlande
© PRINCEPS Editions, Paris, 2003, transferred to Société Française de Parasitologie
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