Serious morbidity and mortality associated with influenza epidemics.
D000367:Age Factors; D004196:Disease Outbreaks / Q000453:epidemiology*; D004812:Epidemiologic Methods; D006760:Hospitalization; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology* / Q000382:microbiology / Q000401:mortality; D013781:Texas