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CMV pneumonia

Definition

Cytomegalovirus (CMV) pneumonia is a viral infection of the lungs that can occur in people who have a suppressed immune system.

Alternative Names

Pneumonia - cytomegalovirus; Cytomegalovirus pneumonia; Viral pneumonia

Causes

CMV pneumonia is caused by a member of a group of herpes-type viruses. Infection with CMV is very common. Most people are exposed to CMV in their lifetime, but typically only those with weakened immune systems become ill from CMV infection.

Serious CMV infections can occur in people with weakened immune systems as a result of:

In people who have had organ and bone marrow transplants, the risk for infection is greatest 5 to 13 weeks after the transplant.

Symptoms

In otherwise healthy people, CMV usually produces no symptoms, or it produces a temporary mononucleosis-type illness. However, those with a weakened immune system can develop serious symptoms. Symptoms may include:

  • Cough
  • Fatigue
  • Fever
  • General discomfort, uneasiness, or ill feeling (malaise)
  • Loss of appetite
  • Muscle aches or joint pains
  • Shortness of breath
  • Sweating, excessive (night sweats)

Exams and Tests

The health care provider will perform a physical exam. In addition, the following tests may be done:

Treatment

The goal of treatment is to use antiviral drugs to stop the virus from copying itself in the body. Some people with CMV pneumonia need IV (intravenous) medicines. Some people may need oxygen therapy and breathing support with a ventilator to maintain oxygen until the infection is brought under control.

Outlook (Prognosis)

Antiviral drugs stop the virus from copying itself, but do not destroy it. The CMV suppresses the immune system, and may increase your risk for other infections.

Low oxygen level in the blood of people with CMV pneumonia often predicts death, especially in those who need to be placed on a breathing machine.

Possible Complications

Complications of CMV infection in people with HIV/AIDS include spread of disease to other parts of the body, such as the esophagus, intestine, or eye.

Complications of CMV pneumonia include:

  • Kidney impairment (from drugs used to treat the condition)
  • Low white blood cell count (from drugs used to treat the condition)
  • Overwhelming infection that doesn't respond to treatment
  • Resistance of CMV to standard treatment

When to Contact a Medical Professional

Contact your provider if you have symptoms of CMV pneumonia.

Prevention

The following have been shown to help prevent CMV pneumonia in certain people:

  • Using organ transplant donors who don't have CMV
  • Using CMV-negative blood products for transfusion
  • Using CMV-immune globulin in certain people

Preventing HIV/AIDS avoids certain other diseases, including CMV, that can occur in people who have a weakened immune system.

Gallery

CMV pneumonia
Cytomegalovirus is a large herpes-type virus commonly found in humans that can cause serious infections in people with impaired immunity. CMV pneumonia is treated with antiviral medications, which may stop the replication of the virus but will not destroy it.
Eye
The eye is the organ of sight, a nearly spherical hollow globe filled with fluids (humors). The outer layer or tunic (sclera, or white, and cornea) is fibrous and protective. The middle layer (choroid, ciliary body and the iris) is vascular. The innermost layer (the retina) is nervous or sensory. The fluids in the eye are divided by the lens into the vitreous humor (behind the lens) and the aqueous humor (in front of the lens). The lens itself is flexible and suspended by ligaments which allow it to change shape to focus light on the retina, which is composed of sensory neurons.

References

Britt WJ. Cytomegalovirus. In: Bennett JE, Dolin R, Blaser MJ, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases. 9th ed. Philadelphia, PA: Elsevier; 2020:chap 137.

Crothers K, Worodria W, Huang L. Pulmonary complications of HIV infection. In: Broaddus VC, Ernst JD, King TE, et al, eds. Murray and Nadel's Textbook of Respiratory Medicine. 7th ed. Philadelphia, PA: Elsevier; 2022:chap 123.

Singh N, Haidar G, Limay AP. Infections in solid-organ transplant recipients. In: Bennett JE, Dolin R, Blaser MJ, eds. Mandell, Douglas, and Bennetts Principles and Practice of Infectious Diseases. 9th ed. Philadelphia, PA: Elsevier; 2020:chap 308.

Last reviewed November 23, 2021 by Jatin M. Vyas, MD, PhD, Associate Professor in Medicine, Harvard Medical School; Associate in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital, Boston, MA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team..

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