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KMID : 0353019680050020113
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Korean Journal of Public Health
1968 Volume.5 No. 2 p.113 ~ p.121
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A Preliminary Survey of Mosquitoes of Che Ju Do Related to Filariasis, on Species, Biology and Infection Status
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Abstract
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The purpose of this study was to be aided in epidemiological and ecological studies of filariasis on Che Ju Island by providing necessary informations concerning species and biology of mosquitoes of the island.
For the study, adults and larvae of mosquitoes were collected by C.D.C. type light trap and aspirator (resting and biting collection) from 21 villages and their vicinities during two summer months August and September of 1968. They were subjected to species identification and dissected under dissecting microscope after the identification to examine its infection status by filaria species larvae.
The results obtained are as follows:
1. The species collected and identified:
In the study areas three genus (Anopheles, Culex and Aedes) and thirteen species of mosquito were identified; A. (Anopheles) lestery, A. sineroides, A. sinensis, C. (Culex) pipiens pallens, C. tritaeniorhyncus, C. vagans, C. bitaeniorhyncus, C. vorax, C. hayashii, Ae. (Aedes) togoi, Ae. albopictus, Ae. vexan and Ae. hatorii. An important fact is that A. sineroides, A. lestery. C. vagans, C. bitaeniorhyncus, C. vorax, and C. hayashii among these species were never been reported before from the island.
2. Geographical distribution of the species:
Among the species collected, C. pipiens had the most wide distribution and dense population throughout the island, then Ae. togoi, Ae. albopictus and C. tritaeniorhyncus followed next order.
3. Biological surroundings for larval habitat :
C. pipiens was found to breed widely in various circumstances ranged from clean ground water to filthy ponds. Ae. togoi bred mainly in tide water of rock pools along shore line although in case of Bi Yang islet, the main beeding habitat was cement water tank retaining rain water. C. tritaeniorhyncus used to be collected from roadside ditches or ponds with filthy water usually mixed with C. pipiens, Ae. hatorii larvae were found in fresh clean water of rock pools along streams of vallies. Anopheles species had relatively numerous places as habitat such as cement water tank clean water ponds, wells. streams, and rice fields even though the larva was very scarce in number. Ae. albopictus had breeding place in artificial containers around houses in orchard and bamboo tree stumps, which are shaded and cool.
4. Species constitution of adult mosquitoes collected in villages:
Adult mosquitoes were collected by light trap, resting and biting collection in these four particular areas where human filariasis survey was conducted. The population collected was largely consisted of Ae. togoi
with the range of 68.9%-93.9% by areas. This fact suggests that a large population of Ae. togoi may be closely related to the endemicity of human filariasis.
5. Study of mosquitoes for the status of natural infection by filaria species:
Only one species among other species examined, Ae. togoi was found to be infected. The natural infection rate of mosquito (Ae. togoi) revaled a strong correlation with that of human filariasis; the infection rate of the mosquito was proportional to human microfilaria rate in all villages studied.
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