Studies on epidemiology of filariasis : Part 1. Observations on natural vectors and their bionomics in the endemic areas of Bancroftian Filariasis in southern Amami Island

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  • Yamamoto Hisashi
    Department of Parasitology, the Institute for Infectious Diseases, the University of Tokyo

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  • フイラリア症の疫学的研究 : 奄美大島南部の流行地における媒介蚊について
  • フィラリア症の疫学的研究
  • フィラリアショウ ノ エキガクテキ ケンキュウ

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Abstract

As a part of the studies on filariasis by members of the Department of Parasitology, the Instute for Infectious Diseases, the University of Tokyo, mosquito surveys were made at the endemic areas of bancroftian filariasis in southern Amami Island during the period of June to October, 1961. A total of 18 species of mosquitoes listed in table 1 were collected from this area. The female mosquitoes collected either by sucking tubes in houses or by light traps were dissected. The positive rates for filarial larvae (all stages included) were 6.4% or 68/1, 059 in Culex pipiens, 0.13% or 1/800 in Culex tritaeniorhynchus and 0.50% or 2/392 in Anopheles hyrcanus and all the other species dissected were negative. The infective stage larvae were recovered from 16 Culex pipiens but not from other species. The infection rates of mosquitoes were much higher in those collected from houses of microfillarial carriers than those in random collections. The densities of mosquitoes and their rates by species were found to differ greatly by the areas surveyed. As the rule, the rates of Culex pipiens among the total collections were higher in urban areas than in the rural villages surrounded by rice fields. As the means of estimating the densities of mosquito breedings in residencial zones, the index was calculated at each community by dividing the number of breeding places of each species by the number of houses, or by dividing the number of positive houses by the total number of houses surveyed.

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