[Antibodies against Asian influenza virus in sera collected before 1956].
D000906:Antibodies; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology*; D009975:Orthomyxoviridae
D000906:Antibodies
INFLUENZA/epidemiology
Anticorpi verso il virus influenzale A-Asia in sieri prelevati prima del 1956.