Serologic comparison of hepatitis A antigen to echovirus 25 isolate CR69(076) recovered from a patient with viral hepatitis

A serologic comparison was performed by immune electron microscopy between hepatitis A antigen (related to the MS-1 strain of hepatitis A virus) and a viral isolate, CR69(076), from the stool of a patient in Costa Rica with viral hepatitis. CR69(076) was not antigenically related to hepatitis A antigen but was related to echovirus 25. Thus, it is unrelated to the MS-1 strain of hepatitis A virus.