title: Studies on the 1973 type B influenza epidemic in Kawasaki city.
mesh_terms: D000328:Adult; D002648:Child; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology* / Q000382:microbiology; D007564:Japan; D008875:Middle Aged; D009975:Orthomyxoviridae / Q000302:isolation & purification*