title: Influenza virus strain identification for the 1991-92 influenza season.
mesh_terms: D002170:Canada / Q000453:epidemiology; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D006801:Humans; D015994:Incidence; D007223:Infant; D009980:Influenza A virus / Q000145:classification / Q000302:isolation & purification*; D007251:Influenza, Human / Q000453:epidemiology / Q000382:microbiology*; D011159:Population Surveillance