Pulmonary actinomycosis Health Article

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Reviewer Info: Sean O. Stitham, MD, private practice in Internal Medicine, Seattle, WA; Jatin M. Vyas, MD, PhD, Instructor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, Massachusetts General Hospital. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.; ADAM Health Illustrated Encyclopedia, 05/19/2008
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Definition

Pulmonary actinomycosis is a rare bacterial lung infection.

Alternative Names

Actinomycosis pulmonary

Causes, incidence, and risk factors

Pulmonary actinomycosis is caused by one of two types of bacteria -- actinomyces or propioni. These bacteria are normally found in the mouth and gastrointestinal tract, where they do not usually cause harm. However, poor dental hygiene and dental abscess can increase your risk for face, jaw, and lung infections caused by these bacteria.

Alcohol abuse, having scars on the lungs (bronchiectasis), and emphysema are all associated with actinomycosis.

Actinomycosis in the lungs causes lung cavities, lung nodules, and pleural effusions. The disease is rare and may occur at any age, but most patients are 30-60 years old. Men get this infection more often than women do.

Symptoms

Signs and tests

The infection often comes on slowly. It may be weeks or months a doctor makes a diagnosis.

Tests that may be done include:

Treatment

The goal of treatment is to control the infection. However, many patients take a long time to get better. You may need to receive penicillin through a vein (intravenously) for 4 to 6 weeks in order to be cured, followed by several months of penicillin by mouth.

If you cannot take penicillin, alternative antibiotics are available. These include tetracyclines, macrolides, or clindamycin.

Surgery may be needed to drain fluid from the lungs and control the infection.

Expectations (prognosis)

Most people get better after treatment with antibiotics.

Complications

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