Hong Kong influenza--1968-1969.
D006723:Hong Kong; D006801:Humans; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000453:epidemiology / Q000517:prevention & control*; D009975:Orthomyxoviridae; D014611:Vaccination / Q000009:adverse effects*
D007252:Influenza Vaccines