Vaccine cost-effective, but underused.
D000293:Adolescent; D000328:Adult; D003362:Cost-Benefit Analysis; D006801:Humans; D007252:Influenza Vaccines / Q000191:economics / Q000600:supply & distribution; D007251:Influenza, Human / Q000191:economics / Q000517:prevention & control*; D008875:Middle Aged; D014481:United States; D014611:Vaccination / Q000191:economics* / Q000706:statistics & numerical data*
D007252:Influenza Vaccines