Incidence of some viral respiratory infection.
D006801:Humans; D015994:Incidence; D007251:Influenza, Human / Q000453:epidemiology*; D011014:Pneumonia; D011019:Pneumonia, Mycoplasma / Q000453:epidemiology*; D011778:Q Fever / Q000453:epidemiology*
INFLUENZA/epidemiology; PNEUMONIA, PRIMARY ATYPICAL/epidemiology; Q FEVER/epidemiology