title: Epidemiology of influenza.
mesh_terms: D000914:Antibodies, Viral; D000956:Antigens, Viral; D002648:Child; D004196:Disease Outbreaks; D005060:Europe; D005787:Gene Frequency; D005814:Genes, Viral; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology* / Q000382:microbiology / Q000401:mortality / Q000635:transmission; D009975:Orthomyxoviridae / Q000145:classification / Q000276:immunology / Q000648:ultrastructure; D011995:Recombination, Genetic; D012621:Seasons; D014481:United States; D014764:Viral Proteins / Q000502:physiology
chemical_list: D000914:Antibodies, Viral; D000956:Antigens, Viral; D014764:Viral Proteins