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Genetic and Rare Diseases Information Center (GARD)

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Cryptogenic organizing pneumonia

Other Names for this Disease
  • COP
  • Idiopathic BOOP
  • Idiopathic bronchiolitis obliterans organizing pneumonia
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Your Question

Is this condition contagious?

Our Answer

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Is cryptogenic organizing pneumonia contagious?

Cryptogenic organizing pneumonia (COP) is a non-infectious disease.[1] Although both infectious and non-infectious causes may be associated with the condition (albeit the exact underlying cause in each case is unknown), COP itself is not contagious.
Last updated: 3/18/2013

What causes cryptogenic organizing pneumonia?

The underlying cause of cryptogenic organizing pneumonia (COP) is unknown (it is idiopathic). Organizing pneumonia is more specifically diagnosed as cryptogenic organizing pneumonia (COP) when, among other characteristics, no definite cause (such as infection or underlying tissue disease) for the condition is found. In other words, any known cause for the pneumonia must be ruled out before stating that organizing pneumonia is really cryptogenic.[2]

Other organizing pneumonias may result from infection (bacteria, viruses, parasites, or fungi); drugs; or a reaction to radiation therapy therapy for breast cancer. Organizing pneumonia also may occur in the specific context of specific disorders such as certain connective tissue disorders, ulcerative colitis, or after lung transplantation or bone marrow grafting.[2]
Last updated: 3/18/2013

  • Edson Marchiori et al. The Reversed Halo Sign on High-Resolution CT in Infectious and Noninfectious Pulmonary Diseases. American Journal of Roentgenology. July 2011; 197(1): Accessed 3/18/2013.
  • Cordier JF. Cryptogenic organizing pneumonia. Clin Chest Med. December 2004; 25(4):727-738.