Mycoplasma pneumonia is a type of atypical pneumonia. It is caused by the bacteria M. pneumoniae. This type of pneumonia usually affects people younger than 40. Various studies suggest that it makes up 15 - 50% of all pneumonia cases in adults and even more in school-aged children.
People at highest risk for mycoplasma pneumonia include those living or working in crowded areas such as schools and homeless shelters, although many people who contract mycoplasma pneumonia have no identifiable risk factor.
The symptoms are generally mild and appear over a period of 1 to 3 weeks. They may become more severe in some people.
Persons with suspected pneumonia should have a complete medical evaluation, including a thorough physical exam and a chest x-ray -- especially because the physical exam may not always be able to tell pneumonia apart from acute bronchitis or other respiratory infections.
Depending on the severity of illness, other tests may be done, including:
Call for an appointment with your health care provider if you develop a fever, cough, or shortness of breath. While there are numerous causes for these symptoms, you will need to be checked for pneumonia.
Also, call if you have been diagnosed with this type of pneumonia and your symptoms become worse.
There is no known way to prevent atypical pneumonia. However, avoiding people who have the infection can help reduce your risk.
Infants, and persons in poor health, especially those with weakened immune systems due to HIV, organ transplants, or other conditions should avoid contact with people who have mycoplasma pneumonia.
Baum SG. Mycoplasma pneumoniae and atypical pneumonia. In: Mandell GL, Bennett JE, Dolin R, eds. Principles and Practice of Infectious Diseases. 7th ed. Philadelphia, Pa: Elsevier Churchill Livingstone; 2009:chap 184.
Mandell LA, Wunderink RG, Anzueto A, et al. Infectious Diseases Society of America/American Thoracic Society consensus guidelines on the management of community-acquired pneumonia in adults. Clin Infect Dis. 2007;44:S27-S72.
Denis Hadijiliadis, MD, Assistant Professor of Medicine, Division of Pulmonary, Allergy and Critical Care, University of Pennsylvania, Philadelphia, PA. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.