Surveillance of schistosoma infection in wild rats of river beach in Yangzhong, Jiangsu, 2017-2019

Abstract

Objective To develop a sensitive and effective monitoring method for Schistosoma japonicum infection in river bank voles, so as to provide a basis for accurate control and prevention of schistosomiasis.

Methods The wild mice were caught by using rat trap in the snail-infested area of the Yangtze River. The captured wild mice were dissected to identify if they had schistosomiasis. The effective rat trap rate, the capture rate and the infection rate were calculated.

Results From 2017 to 2019, there were 2 800 rat trap-times in 13 beaches with snails, including 800 in 4 environments in 2017, 1 200 in 5 environments in 2018, and 800 in 4 environments in 2019. A total of 132 voles were captured, the effective trapping rate was 96.89%, the trapping rate was 4.87%, and the trapping rate was 10.82%, 2.55% and 2.38% respectively from 2017 to 2019, and none of the mice were infected with schistosoma, and the infection rate was 0%.

Conclusion After three consecutive years of surveillance, schistosoma infection in wild rats was not detected, but it should be further carried out continuously. It is suggested that schistosoma infection in wild rats can be the routine surveillance methods in areas where schistosomiasis transmission is blocked.

Abstract

摘要：目的开展江滩野鼠感染血吸虫监测, 探索敏感、有效的监测方法, 为精准防控血吸虫病提供依据。 方法 在江滩有螺环境中采用布设鼠夹的方法捕捉野鼠, 对捕获的野鼠进行解剖, 观察有无血吸虫感染, 分别计算有效鼠夹率、野鼠捕获率和感染率。 结果 2017—2019年, 累计在13个江滩有螺环境中布设鼠夹2 800只次, 其中2017年4个环境800只次, 2018年5个环境1 200只次, 2019年4个环境800只次。共捕获野鼠132只, 有效鼠夹率96.89%, 野鼠捕获率4.87%, 2017—2019年野鼠捕获率分别为10.82%、2.55%、2.38%, 均未发现野鼠感染血吸虫, 感染率为0%。 结论 通过连续三年的监测, 未发现野鼠感染血吸虫, 但应进一步持续开展, 建议在血吸虫病传播阻断地区可将野鼠感染血吸虫监测列为常规监测手段之一。