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Actinomycosis Infection

Chronic suppurative infection by anaerobic gram-positive bacilli with sulfur granule formation.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Internal Medicine department. Book Appointment →

What is Actinomycosis Infection?

Actinomycosis is a chronic granulomatous and suppurative infection caused by Actinomyces species, primarily Actinomyces israelii, A. naeslundii, A. odontolyticus, A. viscosus, and A. meyeri. These are anaerobic to microaerophilic gram-positive filamentous bacilli that are normal flora of the oral cavity, gastrointestinal tract, and female genital tract. Disease occurs when mucosal disruption permits invasion into normally sterile tissues.

Cervicofacial form is most common (50-65%), often after dental procedures, with painless mass progressing to draining sinuses and characteristic 'sulfur granules' (yellow microcolonies). Thoracic form (15-30%) follows aspiration and presents with chronic pneumonia, empyema, mediastinal mass, or chest wall fistulas. Abdominopelvic form (10-20%) frequently follows appendicitis or IUD use, mimicking malignancy or Crohn disease.

Diagnosis is challenging due to slow growth and frequent confusion with cancer or tuberculosis. Anaerobic cultures (often negative if antibiotics given), gram stain showing branching gram-positive rods, sulfur granule histology, and MALDI-TOF or 16S rRNA confirm diagnosis. Treatment requires long-duration (6-12 months) high-dose penicillin or amoxicillin, with surgical drainage of large abscesses or fistulas.

Symptoms

Cervicofacial: painless slowly enlarging jaw or neck mass
Lumpy jaw or facial swelling
Draining sinuses with sulfur granules
Trismus (jaw muscle invasion)
Thoracic: chronic productive cough
Hemoptysis, pleuritic pain
Chest wall mass or fistula
Weight loss, low-grade fever, night sweats
Abdominopelvic: chronic abdominal pain or mass
Right lower quadrant pain (post-appendicitis)
Pelvic pain in IUD users
Vaginal discharge, fistula formation
Hematuria, dysuria (urologic)
CNS: headache, focal deficits (rare brain abscess)
Cutaneous: nodules, sinus tracts
Bone destruction on imaging mimicking malignancy

Risk Factors

Poor dental hygiene, dental caries
Recent dental extraction or surgery
Trauma to oral mucosa
Aspiration (alcoholism, seizures, dementia)
Bisphosphonate-related osteonecrosis of jaw
Long-term IUD use (over 2 years)
Recent abdominal surgery or appendicitis
Diverticulitis
Diabetes mellitus
Immunosuppression (HIV, transplant, chemotherapy)
Chronic alcohol use
Smoking
Foreign body retention
Female pelvic infections
Bisphosphonate use

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Slowly enlarging painless jaw or neck mass
  • Chronic draining sinus from face or neck
  • Sulfur granules visible in drainage
  • Persistent productive cough with chest mass
  • Chronic abdominal mass mimicking cancer
  • Pelvic pain in long-term IUD user
  • Recent dental procedure with persistent local symptoms
  • Weight loss with chronic suppurative lesion
  • Failure of broad-spectrum antibiotics for chronic abscess

Treatment Methods

01
Infectious diseases consultation
02
Imaging: CT, MRI to define extent of involvement
03
Tissue biopsy for histopathology and culture
04
Anaerobic cultures (cover up to 21 days, often negative)
05
Gram stain showing branching gram-positive bacilli
06
Sulfur granule identification (yellow microcolonies)
07
MALDI-TOF mass spectrometry or 16S rRNA sequencing
08
Rule out malignancy with cytology and additional biopsies
09
First-line therapy: penicillin G IV 18-24 million units/day for 4-6 weeks, then oral amoxicillin 500 mg TID for 6-12 months
10
Mild cases: oral amoxicillin 500 mg TID for 6 months
11
Penicillin allergy: doxycycline, clindamycin, or ceftriaxone
12
Pulmonary or CNS involvement: extended IV therapy 6-12 weeks
13
Surgical drainage of large abscesses or fistulas
14
Removal of IUD if pelvic actinomycosis
15
Tooth extraction or dental source eradication
16
Address bone necrosis surgically with debridement
17
Long-term follow-up imaging to confirm resolution
18
Treat for at least 6 months even if symptoms resolve early
19
Patient education on prolonged adherence
20
Multidisciplinary care: ID, surgery, dentistry, radiology
21
Address underlying immunosuppression

Which Department to Visit?

You can visit our Enfeksiyon Hastalıkları department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

Learn About Enfeksiyon Hastalıkları Department

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.