title: [Epidemiology and etiology of acute infections of the lower respiratory tract].
mesh_terms: D000208:Acute Disease; D006801:Humans; D008800:Mexico; D009169:Mycobacterium tuberculosis / Q000302:isolation & purification; D012141:Respiratory Tract Infections / Q000453:epidemiology / Q000209:etiology / Q000401:mortality
vernacular_title: Epidemiología y etiología de las infecciones agudas del aparato respiratorio bajo.