title: Incidence and etiology of pneumonia, croup and bronchiolitis in preschool children belonging to a prepaid medical care group over a four-year period.
mesh_terms: D000906:Antibodies / Q000032:analysis; D001996:Bronchopneumonia / Q000453:epidemiology* / Q000209:etiology; D002648:Child; D002675:Child, Preschool; D005260:Female; D006123:Group Practice; D006801:Humans; D007223:Infant; D007348:Insurance, Health; D007827:Laryngitis / Q000175:diagnosis / Q000453:epidemiology* / Q000209:etiology; D008297:Male; D009174:Mycoplasma / Q000302:isolation & purification; D009175:Mycoplasma Infections; D009976:Orthomyxoviridae Infections; D010849:Picornaviridae / Q000302:isolation & purification; D011014:Pneumonia / Q000175:diagnosis / Q000453:epidemiology* / Q000209:etiology; D012136:Respiratory Syncytial Viruses / Q000302:isolation & purification; D018108:Respirovirus / Q000302:isolation & purification; D012698:Serologic Tests; D014777:Virus Diseases; D014861:Washington
chemical_list: D000906:Antibodies