Parasites, Hosts and Diseases

The Korea Society for Parasitology and Tropical Medicine (대한기생충학·열대의학회)
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Effect of Temperature on Embryonation of Ascaris suum Eggs in an Environmental Chamber

  • Kim, Min-Ki (Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, and Institute of Endemic Diseases, Seoul National University Medical Research Center) ;
  • Pyo, Kyoung-Ho (Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, and Institute of Endemic Diseases, Seoul National University Medical Research Center) ;
  • Hwang, Young-Sang (Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, and Institute of Endemic Diseases, Seoul National University Medical Research Center) ;
  • Park, Ki-Hwan (Department of Food Science & Technology, Chung-Ang University) ;
  • Hwang, In-Gyun (Food Microbiology Division, National Institute of Food and Drug Safety Evaluation) ;
  • Chai, Jong-Yil (Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, and Institute of Endemic Diseases, Seoul National University Medical Research Center) ;
  • Shin, Eun-Hee (Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, and Institute of Endemic Diseases, Seoul National University Medical Research Center)
  • Received : 2012.07.15
  • Accepted : 2012.08.06
  • Published : 2012.09.15
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Abstract

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, $5^{\circ}C$, $25^{\circ}C$, and $35^{\circ}C$. A. suum eggs did not develop over 1 month at the temperature of $5^{\circ}C$. However, other temperature conditions, $25^{\circ}C$ and $35^{\circ}C$, 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 $25^{\circ}C$. The higher temperature, $35^{\circ}C$, slightly accelerated the A. suum egg development compared to $25^{\circ}C$, 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 $35^{\circ}C$ and $25^{\circ}C$ appeared at days 17 and 19 after incubation, respectively. These findings show that $35^{\circ}C$ condition shortens the time for the development of A. suum eggs to the 8-cell-stage in comparison to $25^{\circ}C$, and suggest the possibility of accelerated transmission of this parasite, resulting from global warming and ecosystem changes.

Keywords

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