Influenza-A Hong Kong vaccine and the new variant A-ENG-42-72.
D000293:Adolescent; D002648:Child; D004196:Disease Outbreaks / Q000517:prevention & control; D005260:Female; D006801:Humans; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000517:prevention & control*
D007252:Influenza Vaccines