Actinomycosis is a bacterial infection that results in collections of pus in the body.
This condition can be treated, so contact your doctor if you think you may have actinomycosis.
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Actinomycosis is most often caused by infection specific bacteria. This is normally present in the mouth and, sometimes, in the intestines. The jaw is most commonly involved, with lung and abdominal infections being less common. Very rarely, women may develop abscesses in the reproductive organs or bladder.
Factors that may increase your risk of actinomycosis include:
- Having a dental disease or recent dental surgery
- Liquids or solids that are sucked into lungs
- Having bowel surgery
- Swallowing fragments of chicken or other bones
- Having an intrauterine contraceptive device (IUD) in place for many years
- Having a weakened immune system
- Tissue damage
- Chronic granulomatous disease or other disorder that affects the immune system (children)
Actinomycosis may cause:
- Hard swellings that are usually painless and located around the mouth, neck, or jaw
- Swellings that may produce pus containing tiny, yellowish particles
- Drainage of pus through the skin of the chest or abdomen
- Weight loss
- Cough that produces sputum or blood
- Noticeable swelling or firm mass in the abdomen, especially the lower part
Your doctor will ask about your symptoms and medical history. A physical exam will be done. Tests may include:
- Analyses of pus, sputum, or tissue
Talk with your doctor about the best treatment plan for you. Treatment options include:
High doses of antibiotics
are used to treat actinomycosis. The antibiotics will need to be taken for 6-12 months.
Your doctor will drain pus-containing abscesses.
The best way to reduce your chances of developing actinomycosis is to prevent dental disease by practicing good dental hygiene and regularly visiting your dentist. You should also:
- Brush your teeth twice a day
- Floss daily
- Replace your toothbrush regularly
Actinomycosis. DynaMed website. Available at:
Updated October 20, 2011. Accessed August 6, 2013.
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Sullivan DC, Chapman SW. Bacteria that masquerade as fungi: actinomycosis/nocardia.
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Last reviewed May 2014 by David L. Horn, MD, FACP
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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