title: Tracking down the flu epidemics.
mesh_terms: D004196:Disease Outbreaks; D006801:Humans; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000382:microbiology; D009975:Orthomyxoviridae / Q000302:isolation & purification*; D014944:World Health Organization
chemical_list: D007252:Influenza Vaccines