title: Influenza A isolates--United States, 1987.
mesh_terms: D000293:Adolescent; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D005260:Female; D006801:Humans; D009980:Influenza A virus / Q000302:isolation & purification*; D007251:Influenza, Human / Q000382:microbiology*; D008297:Male; D008875:Middle Aged; D014481:United States