Need to define optimum route for influenza vaccine injection.
D006801:Humans; D007252:Influenza Vaccines / Q000008:administration & dosage* / Q000276:immunology; D007273:Injections, Intramuscular; D007279:Injections, Subcutaneous; D009339:Needles; D017410:Practice Guidelines as Topic
D007252:Influenza Vaccines