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Korean J Parasitol > Volume 7(3):1969 > Article

Original Article
Korean J Parasitol. 1969 Dec;7(3):153-159. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1969.7.3.153
Copyright © 1969 by The Korean Society for Parasitology
A study on Aedes togoi as vector of filariasis in Che Ju lsland
Won Young Lee
School of Public Health, SeouI NationaI University, Korea.
Abstract

A study on the Aedes togoi to find out important biological and ecological factors as an efficient vector of filariasis, was carried out on Che-Ju Island for two years from 1968 though 1969. Results obtained are as followings:

1) Geographical distribution of the mosquito breeding habitat was found to be extensive covering circular areas of about three km distance along the shore line. The main breeding sites were rockpools and smaller holes on rocks retaining tide and/or rain water with high larval density; water tanks, pots, and other artificial containers retaining only rain water around the houses located within the area with relatively low larval density.

2) Species constitution of adult mosquitos collected in the study villages consisted largely of Aedes togoi with a range of 70-90 per cent by village.

3) The pH of the breeding sites ranged from 5.0 to l0.0, and the chloride content from 0.01 to 28.75 (gm/l). More than fifty per cent of examined sites, however, had pH 5.6-6.5 and chloride content of less than 1.0 gm/L.

4) The natural infection rate of A. togoi by filaria showed proportional relationships with microfilaria rates among the human population by area.

5) Experimental infection of A. togoi by human and dog filaria demonstrated that this species is an efficient vector for both filaria species proved by natural infection as well as experimental infection.

6) Susceptibility of both larva and adult of A. togoi to insecticide, DDT and dieldrin, showed considerable sensitivity in all villages tested.

Figures


Fig. 1
Geographical extent of breeding habitats for Aedes togoi on Che Ju Island.


Fig. 2
Logarithmic paper for recording the susceptibility of adult mosquito.


Fig. 3
Logarithmic paper for recording the susceptibility of adult mosquito.


Fig. 4
Logarithmic probability paper for recording the susceptibility of mosquito larva.


Fig. 5
Logarithmic probability paper for recording the susceptibility of mosquito larva.

Tables


Table 1
Percent distribution of adult mosquitos by species collected in study villages(1968)


Table 2
Percent distribution of adult mosquitos by species (Resting collection only 1969)


Table 3
pH range of breeding haditats of Aedes togoi


Table 4
Chloride conent (gm/l) of breeding habitats for Aedes togoi


Table 5
Natural mosquito infection by filaria compared with human infection


Table 6
Result of experimental mosquito infection by filaria species and villgae


Table 7
Frequency distribution of infective larvae of human and dog filaria by body site in experimentally infected A. tofoi (20 days from infection)


Table 8
An example of WHO test for insecticide-resistance in adult mosquitos

Insecticide : DDT Locality ; Tae Hung, Che Ju Do, Korea Species; Aedes togoi


References
1. Kim HK, Seo BS. [Studies on filariasis in Korea: On the morphology and development of larvae of Brugia malayi in Aedes togoi]. Korean J Parasitol 1968;6(1):1–13.
 
2. Ramachandran C.P.. Med J Malaya 1968;22(3):198–203.
 
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