title: Epidemic of echovirus 11 infections in Japan in 1971.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D004457:Echovirus Infections / Q000453:epidemiology*; D029822:Enterovirus B, Human / Q000302:isolation & purification; D006801:Humans; D007223:Infant; D007564:Japan