Mucormycosis
A rare, fast-moving fungal infection that needs urgent treatment
Quick Facts
- Type: Invasive fungal infection
- Caused by: Mucormycete molds in soil and decaying matter
- Highest risk: Uncontrolled diabetes, weak immune system
- Seek urgent care: Facial swelling, black tissue, fever in at-risk people
Overview
Mucormycosis is a rare but aggressive infection caused by a group of molds called mucormycetes, which live naturally in soil, compost, and rotting leaves or wood. Most people breathe in or come into contact with these mold spores every day without any harm. The infection takes hold mainly when the body's defenses are weakened, such as in people with poorly controlled diabetes, certain cancers, organ transplants, or those taking medicines that suppress the immune system.
The mold tends to invade blood vessels, which is why the infection can spread quickly and damage tissue. Sometimes called black fungus because of the dark, dying tissue it can produce, mucormycosis is a medical emergency. Prompt diagnosis, antifungal medication, and often surgery give the best chance of recovery.
Symptoms
Symptoms depend on which part of the body is affected. The most common form starts in the sinuses and can spread toward the eyes and brain.
- Sinus and brain form: one-sided facial swelling or pain, nasal congestion, black crusts or sores inside the nose or on the roof of the mouth, headache, and fever.
- Lung form: fever, cough, chest pain, and shortness of breath.
- Skin form: a painful, reddened area that may blister, turn black, or form an ulcer, often where the skin was injured.
- Spreading (disseminated) form: can affect the brain, heart, or other organs and cause confusion or changes in mental state.
Blurred or double vision, drooping of one eye, or blackened skin are warning signs that need emergency evaluation.
Causes
Mucormycosis is caused by exposure to mucormycete mold spores, which are widespread in the environment. People usually become infected by:
- Breathing in spores from the air, which can settle in the sinuses or lungs.
- Contact with a wound, such as a cut, burn, scrape, or surgical site, allowing the mold to enter the skin.
- Rarely, swallowing spores in contaminated food, which can affect the digestive tract.
The infection is not spread from person to person. It develops mainly when the immune system cannot clear the spores normally, allowing the mold to grow and invade tissue.
Risk Factors
- Diabetes, especially when blood sugar is poorly controlled or during diabetic ketoacidosis
- A weakened immune system from cancer, chemotherapy, or HIV
- Organ or stem cell transplant
- Long-term use of corticosteroids or other immune-suppressing drugs
- Iron overload or certain iron-related treatments
- Skin injury from burns, trauma, or surgery
Diagnosis
Because the infection moves quickly, doctors aim to diagnose it fast. Evaluation may include:
- Physical exam and history, looking for risk factors and telltale tissue changes.
- Tissue sample (biopsy): a sample from the affected area is examined under a microscope and cultured to identify the mold.
- Imaging: CT or MRI scans of the sinuses, lungs, or brain to show how far the infection has spread.
- Endoscopy: a small camera to inspect the nasal passages and sinuses.
Treatment
Mucormycosis requires urgent, aggressive treatment and is usually managed in the hospital. Care typically combines several approaches:
- Antifungal medication: strong intravenous antifungal drugs are started as early as possible and may later switch to pills.
- Surgery: removing infected and dead tissue is often essential to stop the spread, and can involve the sinuses, eye, or other areas.
- Treating the underlying cause: getting blood sugar under control, reducing immune-suppressing medicines where safe, and supporting the immune system.
The earlier treatment begins, the better the outlook. Because the infection can be life-threatening, any delay in care worsens the chances of recovery.
Prevention
- Keep diabetes well controlled, since high blood sugar is a major risk factor
- Protect skin wounds and keep them clean and covered
- Wear a mask and gloves when handling soil, compost, or decaying material if you have a weakened immune system
- Avoid dusty construction or demolition sites when immune defenses are low
- Take antifungal preventive medicine if your doctor recommends it during high-risk treatment
When to See a Doctor
Seek emergency care right away if you have a weakened immune system or diabetes and develop:
- Sudden facial or sinus pain with swelling on one side
- Black sores or crusts in the nose or mouth
- Blurred or double vision, or a drooping eye
- Fever with cough or chest pain
- Confusion or changes in alertness
Do not wait. This infection can advance within days, and fast treatment greatly improves the outcome.
Frequently Asked Questions
Is mucormycosis contagious?
No. Mucormycosis cannot be passed from person to person. People become infected by breathing in mold spores from the environment or through contact with a wound, not from someone who is sick.
Why is it called black fungus?
The nickname comes from the dark, dying tissue that the infection can create as it cuts off blood supply to the affected area. The fungus itself is not literally black, but the damaged tissue often turns dark.
Who is most at risk for mucormycosis?
People with poorly controlled diabetes, those with weakened immune systems from cancer or transplants, and people taking immune-suppressing medicines are at highest risk. Healthy people rarely develop the infection.
How serious is mucormycosis?
It is a serious, potentially life-threatening infection that can spread quickly. Early diagnosis, antifungal drugs, and surgery to remove infected tissue are critical, so anyone with warning signs should seek emergency care immediately.
References
- Centers for Disease Control and Prevention (CDC). Mucormycosis.
- Mayo Clinic. Fungal infections.
- MedlinePlus, U.S. National Library of Medicine. Mucormycosis.
- National Organization for Rare Disorders (NORD). Mucormycosis.