title: Parainfluenza virus type 3: surveillance.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D004739:England / Q000453:epidemiology; D006801:Humans; D007223:Infant; D008875:Middle Aged; D010224:Parainfluenza Virus 3, Human; D018184:Paramyxoviridae Infections / Q000453:epidemiology* / Q000382:microbiology; D011159:Population Surveillance; D014852:Wales / Q000453:epidemiology