490> Geography 。Climate Beijing,2006,June-August... Headaches,Fever,Neck stiffness,Sensitivity to light... Angiostrongylus cantonensis Winkles (Pomacea canaliculata) parasitic nematode (roundworm) Clime and bacteria,parasite,virus...• Climate Geography Winkles （Pomacea canaliculata） Angiostrongylus cantonensis： parasitic nematode (roundworm) Headaches，Fever，Neck stiffness，Sensitivity to light… Beijing , 2006, June - August… Clime and bacteria, parasite, virus…