Current respiratory infections.
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D004739:England / Q000453:epidemiology; D006801:Humans; D007223:Infant; D011019:Pneumonia, Mycoplasma / Q000453:epidemiology; D018357:Respiratory Syncytial Virus Infections / Q000453:epidemiology; D012141:Respiratory Tract Infections / Q000453:epidemiology*; D014852:Wales / Q000453:epidemiology