Virus infections of the upper respiratory tract.
D000328:Adult; D000367:Age Factors; D002648:Child; D004196:Disease Outbreaks; D006306:Health Surveys; D006801:Humans; D007244:Infectious Mononucleosis / Q000175:diagnosis; D007251:Influenza, Human / Q000453:epidemiology; D018184:Paramyxoviridae Infections / Q000453:epidemiology; D012141:Respiratory Tract Infections / Q000175:diagnosis / Q000453:epidemiology*; D014777:Virus Diseases / Q000175:diagnosis / Q000453:epidemiology*