WHO calls for vaccine boost to prepare for flu pandemic.
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D000818:Animals; D001717:Birds / Q000821:virology; D002986:Clinical Trials as Topic / Q000639:trends; D006801:Humans; D007252:Influenza Vaccines / Q000276:immunology / Q000600:supply & distribution*; D007251:Influenza, Human / Q000453:epidemiology* / Q000517:prevention & control* / Q000635:transmission; D038622:Internationality; D014944:World Health Organization
D007252:Influenza Vaccines