IMPACT OF WATER TEMPERATURE ON SHEDDING AND INFECTIVITY OF CERCARIAE OF SCHISTOSOMA JAPONICUM
- VernacularTitle:水温对日本血吸虫尾蚴的逸出及其感染力的影响
- Author:
Yousheng LIANG
;
Jianrong DAI
;
Hongjun LI
;
Yongliang XU
;
Ming XU
;
Yinchang ZHU
- Publication Type:Journal Article
- Keywords:
Schistosoma japonicum[WT5”BZ];
Cercaria;
Water temperature;
Infectivity
- From:
Chinese Journal of Schistosomiasis Control
1989;0(03):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To observe the impact of water temperature on shedding and infectivity of the cercariea of Schistosoma japonicum under laboratory condition. Methods Infected snails were exposed to 1, 5, 10, 15, 20, 25, 30, 35℃ and 40℃ water for 4 hours for shedding of cercariae respectively, the shedding rates and total numbers of cercariae shed were investigated. The mice were infected with cercariae in 1, 10, 20, 30℃ and 40℃ water for 30 minutes respectively, the infection rates and mean worm burden of mice were investigated. Results The cercariae were shed from infected snails with Jiangsu or Yunnan isolate of [WT5”BX]S. japonicum in water ranged from 1℃ to 40℃, but the fittest water temperatures range for shedding of cercariae of Yunnan isolate of S.japonicum[WT5”BZ] is from 20℃ to 35℃, while fittest range for Jiangsu isolate is from 15℃ to 35℃. All of the infection rates of mice infected with cercariae of Jiangsu isolate of S.japonicum in the water ranged from 1℃ to 40℃ were 100.0%. Infection rates of mice infected with cercariae of Yunnan isolate of S. japonicum in the water ranged from 1℃ to 40℃ were more than 83.3%. Conclusions When infected snails are exposed to the water with temperature ranged from 1℃ to 40℃ it is possible for cercariae to shed and infect the final hosts . It is suggested that there is a possibility of infection with S.japonicum when contacting the water near marshlands with infected snails in winter.
