Influenza vaccine and the elderly--low demand from a high-risk group.
D000367:Age Factors; D000368:Aged; D001294:Attitude to Health; D006801:Humans; D007252:Influenza Vaccines / Q000008:administration & dosage*; D007251:Influenza, Human / Q000517:prevention & control*; D012306:Risk
D007252:Influenza Vaccines