南安市广州管圆线虫媒介宿主密度及感染率季节性变化的调查

Investigation on the host density and seasonal changes of infection rate of Angiostrongyliasis cantonensis in Nanan City,Fujian Province

目的了解南安市广州管圆线虫媒介宿主密度及感染率。方法在广州管圆线虫病疫源地选择调查点,在不同季节捕捉广州管圆线虫媒介宿主褐云玛瑙螺、福寿螺、蛞蝓及终末宿主鼠类等动物,进行密度和感染率调查,并分析其季节变化。结果褐云玛瑙螺、福寿螺、蛞蝓均检出广州管圆线虫Ⅲ期幼虫。其中,褐云玛瑙螺感染率最高,为36.12%(108/299),且感染高峰在秋季,感染率为63.24%(43/68)。终末宿主鼠的心肺成虫检出率为9.56%(13/136)。结论南安市是广州管圆线虫严重的自然疫源地,媒介宿主密度及感染率随季节变化。

Objective To determine host density and seasonal change of infection rate of Angiostrongyliasis cantonensis in Nanan City. Methods The intermediate hosts Achatina fulica and Pila gigas and the definitive host vole of A. cantonensis were collected to examine and analyze infection condition of different seasons. Results The third larvae of A. cantonensis were examined from A. fulica, P. gigas et al. The infection rate of A. fulica was the highest, which was 36.12%（108/299）. The infection rate of autumn among season was the highest, which was 63.24%（43/68）. The detection rate of perfect insects in the heart and lung of murine whose is the final host was 9.56% （13/136）. Conclusion Nanan City is the epidemic focus of A. cantonensis. The infective intensity and infection rate of the intermediary hosts were changed with seasonal variation.