title: Challenges in improving influenza vaccine protection in the elderly.
authors.forename: Nikolai
authors.initials: N
authors.lastname: Petrovsky
authors.forename: Ted M
authors.initials: TM
authors.lastname: Ross
mesh_terms: D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D006760:Hospitalization; D006801:Humans; D007252:Influenza Vaccines / Q000276:immunology*; D007251:Influenza, Human / Q000453:epidemiology* / Q000401:mortality / Q000473:pathology / Q000517:prevention & control*; D008875:Middle Aged
chemical_list: D007252:Influenza Vaccines