Influenza in Canada, 1990-91 and 1991-92 season.
D000293:Adolescent; D000328:Adult; D002170:Canada / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D006801:Humans; D015994:Incidence; D007223:Infant; D009980:Influenza A virus / Q000302:isolation & purification; D009981:Influenza B virus / Q000302:isolation & purification; D007251:Influenza, Human / Q000453:epidemiology* / Q000382:microbiology; D008875:Middle Aged; D011159:Population Surveillance; D012621:Seasons; D014776:Virus Cultivation