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• W2359893563 abstract "Culex pipiens var.pollens,Aedes albopictus,C.tritaeniorhynchus,Armi-geres obturbans,Anopheles hyrcanus var.sinensis,and Lutzia fuscanus arecommon species of mosquitoes found in Shanghai area.Mosquitoes rearedfrom larvae were fed on dog of dirofilarial infection under identical conditionsin laboratory.From the result of dissection of the infected mosquitoes afterthe incubation period of 13—15 days,it was found that microfilaria normallycompleted its development to infective stage in Ae.albopictus,A.hyrcanus,C.pipiens,and C.tritaeniorhynchus.In Ar.obturbans,all the microfilariae,though capable of penetrating into the mosquito's Malpighian tubules,perishedand chitinized.L.fuscanus refused to feed on dog-blood. Of the four species of mosquitoes in which complete development of fila-rial larva took place,C.pipiens was found to have the highest percentage ofinfection (48.54%).A.hyrcanus and Ae.albopictus were next in the infectionrate (19.04% and 18.13% respectively),and C.tritaneniorhynchus was found to give the lowest rate (7.3%).The development rate (host efficiency ofKartman) of A.hyrcanus,Ae.albopictus,C.pipiens and C.tritaeniorhynchuswas 7.57%,4.01%,1.01% and 0.21% respectively.From these data it wasevident that awong these,the highest percentage of the ingested microfilariaedeveloped into infective stage in the anopheline mosquitoes,whereas the twoCulex species were found to have very low development rate.Ae.albopictuswas next to the anopheline mosquito in the rate.When kept in the laboratory,72.4% of C.pipiens,62.88% of Ae.albopictus,30.48% of C.tritaeniorhychus,and 17.02% of A.hyrcaus survived the incubation period of 13—15 days. Under laboratory conditions,Aedes mosquitoes fed greedily on dog-bloodand 90% of them became engorged after 2-hours' feeding.A.hyrcanus andC.tritaeniorhynchus did bite the dog but not very readily.Only a smallpercentage of C.pipiens (16.6%),when fed on dog,became engorged. Taking all the above mentioned factors into consideration,transmission ofthe canine filariasis by the experimental mosquitoes could be evaluated by theindex of experimental infection of Kartman.The index was 0.004571,0.003507,0.002453 and 0.000047 for Ae.albopictus,C.pipiens,A.hyrcaus,and C.tritaeniorhychus respectively.Considering in addition the biting habits of themosquitoes it might be,concluded that Ae.albopictus is the most appropriateexperimental host for the canine filariasis and probably acts as its naturalvector.C.pipiens seems to affear as a better host than A.hyrcanus,butwas in fact inferior to it,because of its low rate of development and itsreluctance to feed on the dog. The number of microfilariae ingested by individual mosquitoes fed simul-taneously on the same dog varied quite extremely.In Armigeres the microfi-lariae migrated most rapidly into the Malpighian tubules,but in the Culexmost of them remained in the midgut where they became entangled in therapidly clotting blood and finally died the next day after feeding.In theanopheline and Aedes mosquitoes there were some microfilariae found still alivein the stomach as long as 24 hours after feeding. Contrary to the finding of Rosen (1955) of a single terminal papilla inthe tail of the infective stage of the filarial parasite,there were seen threepapillae,one situated dorsally and two subventrally.As compared with thesame stage of human filariae these papillae are inconspicuous and easily mis-sed when not viewed from a proper position." @default.
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• W2359893563 date "1958-01-01" @default.
• W2359893563 modified "2023-09-23" @default.
• W2359893563 title "EXPERIMENTAL INFECTION OF LOCAL COMMON MOSQUITOES WITH DIROFILARIA IMMITIS IN SHANGHAI AREA,CHINA" @default.
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