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Occult pneumonia is a pneumonia that is not observable directly by the eye, but can only be shown indirectly, especially by radiography. Occult pneumonia can be made visible by chest X-rays. The general symptoms ''cough for more than 10 days'' and ''fever for more than 3 days'' can indicate the presence of occult pneumonia, just as a temperature of 39°C or higher and a high white blood cell count. 〔C.G. Murphy et al. (''Clinical predictors of occult pneumonia in the febrile child.'' ) Acad. Emerg. Med. 14(3), 243–249 (2007) (PMID 17242382 ).〕 Administration of a pneumococcal vaccine decreases the incidence of occult pneumonia, which suggests that ''Streptococcus pneumoniae'' is a cause of occult pneumonia. Occult pneumonia, however, can also be the result of atypical pneumonia. 〔Commission on Acute Respiratory Diseases, Fort Bragg, North Carolina (Primary Atypical Pneumonia ) American J. of Public Health, April, 1944; Vol. 34〕 Although pneumococcal vaccination lowers the prevalence of occult pneumonia, it does not make radiographic diagnosis superfluous at patients with prolonged fever, cough or leukocytosis. 〔 〔M.S. Rutman, R. Bachur, M.B. Harper (''Radiographic pneumonia in young, highly febrile children with leukocytosis before and after universal conjugate pneumococcal vaccination.'' ) Pediatr Emerg Care. 2009 Jan;25(1):1-7〕 Etymology: the term is derived from the Latin ''occultus'' = hidden, secret and ''pneumonia'' = inflammation of the lungs > Greek: ''pneuma'' = wind and Indo-European: ''pleumon'' = floating, swimming. 〔Ioanna Ramoutsaki, Ioannis Ramoutsakis and Demosthenes Bouros (''Pneumonology or Pneumology?'' ) PDF () CHEST, May 2002 vol. 121 no. 5 1385-1387; 〕 〔van Dale, Etymologisch woordenboek; 1ste dr., 1989〕 == See also == Fecal occult blood 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Occult pneumonia」の詳細全文を読む スポンサード リンク
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