室内饲养传代云南光壳钉螺生存分析

目的观察云南光壳钉螺在实验室内生存时间。方法在云南省鹤庆县和永胜县血吸虫病流行区现场采集钉螺,室内经逸蚴法选择未感染血吸虫的成螺采用泥盘草纸法饲养,观察并比较两地钉螺生存期。结果云南光壳钉螺成螺室内1、2、3、4年生存率分别为72.36%、29.11%、13.08%和0.21%,其中鹤庆钉螺1、2、3、4年生存率分别为74.66%、38.91%、19.46%和0.45%,永胜钉螺1、2、3、4年生存率分别为70.36%、20.55%、7.51%和0。云南光壳钉螺成螺平均生存时间为20.90个月、中位生存时间为20.67个月,其中鹤庆钉螺平均生存时间为22.94个月、中位生存时间为21.63个月,永胜钉螺平均生存时间为19.13个月、中位生存时间为19.81个月,差异均有统计学意义(P均<0.05)。结论云南光壳钉螺成螺室内平均生存时间约为20个月,不同产地钉螺生存期有所差异。

Survival analysis of laboratory-bred smooth-shelled Oncomelania snails in Yunnan Province

Objective To investigate the survival period of Yunnan Province-derived smooth-shelled Oncomelania snails bred in laboratory.Methods Oncomelania snails were sampled from Heqing and Yongsheng counties where schistosomiasis is endemic,and uninfected adult snails were collected and bred in laboratory.The survival period of snails sampled from these two counties was compared.Results The 1-,2-,3-and 4-year survival rates of laboratory-bred smooth-shelled snails sampled from Yunnan Province-were 72.36%,29.11%,13.08%and 0.21%,respectively,and-were 74.66%,38.91%,19.46%and 0.45%for snails derived from Heqing County,and 70.36%,20.55%,7.51%and 0 for snails sampled from Yongsheng County,respectively.The mean and median survival period of Yunnan Province-derived adult snails was 20.90 and 20.67 months,and there were significant differences between the snails sampled from Heqing and Yongsheng counties in terms of the mean(22.94 vs.19.13 months,P<0.05)and median survival period(21.63 vs.19.81 months,P<0.05).Conclusion The mean survival period of Yunnan Province-derived smooth-shelled adult snails is approximately 20 months in laboratory,and the survival varies in geographical areas.