[Viral pneumopathies. Introduction].
D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D007558:Italy; D012141:Respiratory Tract Infections / Q000453:epidemiology*; D012621:Seasons; D014777:Virus Diseases / Q000453:epidemiology*
Neumopatías virales. Introducción.