The survey of the natural epidemic foci of Angiostrongylus cantonensis in Beihai City of Guangxi

Abstract

Objective To reveal the distribution of Angiostrongylus cantonensis in Beihai City of Guangxi,thus to provide scientific basis for the prevention and control of angiostrongyliasis.Methods Wengshan Village in Haicheng District of Beihai City was selected for investigation.The hosts of Angiostrongylus cantonensis in the field,markets and restaurants were collected.Larvae was examined in the intermediate host snails by enzyme digestion method,while in paratenic host crabs by homogenization methods.The pulmonary arterial system was dissected to find the adult worms in definitive host rats.Results The intermediate host,paratenic host and definitive host were found in the wild.The intermediate host,paratenic host were soled in the market.A total of 494 various host was examined,49 were infected with the infection rate of 9.92％.Pomacea canaliculata,Achatinafulica and Limax were collected in the field.The highest infection rate was 37.50％(21/56) in Limax,the next was 21.43％(21/98) in Achatinafulica.Fifty-eight definitive hosts rodents were captured and the infection rate was 1.72％(1/58),the main infection specie was Rattus flavipectus.Pomacea canaliculata,Cipangopaludina,Sinotaia quadrata and crab were collected in the market.The highest infection rate was found in Sinotaia quadrata,up to 17.39％(4/23),followed by 4.35％(2/46) in Pomacea canaliculata.No infection was found in crab.Conclusion Beihai City is epidemic foci of Angiostrongylus cantonensis.and natural infection was found in its intermediate and definitive hosts. Key words: Angiostrongylus cantonensis ;  Epidemic foci ;  Epidemiological survey ;