title: Serological diagnosis of influenza:  antibody levels in relation to the concentration of virus used in the hemagglutination-inhibition test.
authors.forename: R L
authors.initials: RL
authors.lastname: WOOLRIDGE
authors.forename: Y E
authors.initials: YE
authors.lastname: CRAWFORD
mesh_terms: D006384:Hemagglutination; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007251:Influenza, Human / Q000175:diagnosis*; D012698:Serologic Tests