WHO announces flu vaccine formula for 1998-1999.
D000956:Antigens, Viral / Q000276:immunology; D006801:Humans; D009980:Influenza A virus / Q000276:immunology*; D009981:Influenza B virus / Q000276:immunology*; D007252:Influenza Vaccines / Q000008:administration & dosage / Q000276:immunology*; D007251:Influenza, Human / Q000517:prevention & control; D014944:World Health Organization
D000956:Antigens, Viral; D007252:Influenza Vaccines