title: Effect of temperature on embryonation of Ascaris suum eggs in an environmental chamber.
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°C, 25°C, and 35°C. A. suum eggs did not develop over 1 month at the temperature of 5°C. However, other temperature conditions, 25°C and 35°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°C. The higher temperature, 35°C, slightly accelerated the A. suum egg development compared to 25°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° and 25°C 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°C, and suggest the possibility of accelerated transmission of this parasite, resulting from global warming and ecosystem changes.
authors.affiliation: Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, Seoul National University Medical Research Center, Seoul, Korea.
authors.forename: Min-Ki
authors.initials: MK
authors.lastname: Kim
authors.forename: Kyoung-Ho
authors.initials: KH
authors.lastname: Pyo
authors.forename: Young-Sang
authors.initials: YS
authors.lastname: Hwang
authors.forename: Ki Hwan
authors.initials: KH
authors.lastname: Park
authors.forename: In Gyun
authors.initials: IG
authors.lastname: Hwang
authors.forename: Jong-Yil
authors.initials: JY
authors.lastname: Chai
authors.forename: Eun-Hee
authors.initials: EH
authors.lastname: Shin
mesh_terms: D000818:Animals; D017165:Ascaris suum / Q000196:embryology* / Q000254:growth & development / Q000528:radiation effects*; D003470:Culture Media; D004531:Eggs / Q000528:radiation effects; D006813:Humidity; D007814:Larva / Q000254:growth & development / Q000528:radiation effects; D012822:Silicon Dioxide; D013696:Temperature
chemical_list: D003470:Culture Media; D012822:Silicon Dioxide