title: Influenza activity--worldwide--and influenza vaccine availability--United States.
mesh_terms: D001208:Asia; D005060:Europe; D006801:Humans; D007252:Influenza Vaccines / Q000600:supply & distribution*; D007251:Influenza, Human / Q000453:epidemiology* / Q000517:prevention & control; D010139:Pacific Islands; D013020:South America; D014481:United States
chemical_list: D007252:Influenza Vaccines