A clinical study on trichinosis in Changwat Phayao, Thailand.

An epidemic of trichinosis occurred in Northern Thailand. The source meat was a 150 kg hilltribe pig. A clinical investigation was conducted using indirect IgG ELISA as a criteria for diagnosis. 52 suspected cases who had eaten the trichinous pork and developed relevant symptoms were hospitalized. 49 of them gave positive ELISA within 64 days after infection. The most common clinical features were myalgia (100%), fever (93.88%) and facial edema (87.71%). Diarrhea was found in approximately one half of the patients (55.10%). Skin rashes of various types were unexpectedly high (40.82%).