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KMID : 0425120120500030239
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Parasites, Hosts and Diseases
2012 Volume.50 No. 3 p.239 ~ p.242
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Effect of Temperature on Embryonation of Ascaris suum Eggs in an Environmental Chamber
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Kim Min-Ki
Pyo Kyoung-Ho
Hwang Young-Sang
Park Ki-Hwan
Hwang In-Gyun
Chai Jong-Yil
Shin Eun-Hee
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Abstract
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The influence of temperature on the development and embryonation of Ascaris suum eggs was studied using coarse sand medium in an environmental chamber with 50% humidity. The time required for development and embryonation of eggs was examined under 3 different temperature conditions, 5℃, 25℃, and 35℃. A. suum eggs did not develop over 1 month at the temperature of 5℃. However, other temperature conditions, 25℃ and 35℃, induced egg development to the 8-cell-stage at days 5-6 after incubation. All eggs examined developed to the 8-cell stage at day 6 after incubation in the sand medium at 25℃. The higher temperature, 35℃, slightly accelerated the A. suum egg development compared to 25℃, and the development to the 8-cell stage occurred within day 5 after incubation. The formation of larvae in A. suum eggs at temperatures of 35℃ and 25℃ appeared at days 17 and 19 after incubation, respectively. These findings show that 35℃ condition shortens the time for the development of A. suum eggs to the 8-cell-stage in comparison to 25℃, and suggest the possibility of accelerated transmission of this parasite, resulting from global warming and ecosystem changes.
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KEYWORD
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Ascaris suum, environmental chamber, helminth, temperature, humidity, embryonation
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