Race for pandemic flu vaccine rife with hurdles.
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D000818:Animals; D002645:Chickens; D002986:Clinical Trials as Topic; D006801:Humans; D009980:Influenza A virus / Q000276:immunology*; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000517:prevention & control* / Q000821:virology
D007252:Influenza Vaccines