title: [Observation on recent cases of acute diarrhea caused by an unknown pathogen].
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D003968:Diarrhea, Infantile / Q000453:epidemiology / Q000276:immunology / Q000382:microbiology*; D005260:Female; D006801:Humans; D007223:Infant; D007564:Japan; D008297:Male; D014780:Viruses / Q000302:isolation & purification