【Abstract】 Objective To study the natural infection situation of Angiostrongylus cantonensis in murid from Maoming city of Guangdong province. Methods The rats were caught with live trap and snap trap method and identified with microscope. The adults of A.cantonensis were examined in lungs and hearts of the rats. Results A total of 196 rats were collected, and the natural infection rate of A.cantonensis was 10.71%. The natural infection rates of A.cantonensis in Rattus norvegicus and Mus musculus were about 11.93%(21/176) and 0(0/20) respectively. Conclusion There is a high infection level of A.cantonensis in R.norvegicus in Maoming city and R.norvegicus is an important final host in this area.

Objective To investigate the natural infection rate of Angiostrongylus cantonensis, Strobilocercus fasciolaris, Capillaria hepatica and Trichinella spiralis in rats from countryside of Lianjiang district of Guangdong province. Methods The parasites above were examined in lungs,livers and diaphragms of rats captured from both indoors and outdoors. Results 236 rats belong to six species were obtained in total. Rattus flavipectus is the most ( 58.5%) dominant species in number. R.norvegicus is the second ( 22.5%). Mus musculus, Suncus murinus, Rattus sladeni and Rattus confucianus are totally 19%. Total infection rate of the parasites in these rats is about 35.59%. The natural infection rates of A.cantonensis,Strobilocercus fasciolaris,C.hepatica and T.spiralis are 17.37%,16.95%,1.27% and 0 respectively. Among different rat species,parasite infection rate of R.norvegicus is the highest ( 66.00%) and R.flavipectus is the second ( 35.50%). Furthermore the natural infection rates of A.cantonensis in rats captured from the wild is significantly higher than that from the domicile. S.fasciolaris is easier to be found in rats captured from the wild too. However, C.hepatica is only discovered in R.norvegicus captured from the domicile. Conclusion The infection of A.cantonensis and S.fasciolar is prevalent and serious in rats from countryside of Lianjiang district of Guangdong province,the infection of C.hepatica also exists in the rats.