Understanding MARCoNS, Mold Illness & Chronic Sinusitis. How to test and how to treat.

Could a chronic bacterial or fungal infection be the cause of your chronic sinusitis?

How a Compounded Nasal Spray Can Help You Finally Feel Better

If you struggle with ongoing sinus issues—congestion, pressure, post-nasal drip, headaches, or recurrent infections—you’re not alone. For many patients with mold exposure or Chronic Inflammatory Response Syndrome (CIRS), the root cause is something called MARCoNS.

What Is MARCoNS?

MARCoNS stands for Multiple Antibiotic-Resistant Coagulase-Negative Staph—a type of stubborn bacteria that lives deep in the sinuses.

It doesn’t usually cause severe infections, but it keeps the sinuses inflamed, disrupts the immune system, and makes it harder for the body to recover from mold-related illness.

Patients with MARCoNS often experience:

• Chronic congestion
• Sinus pressure or pain
• Post-nasal drip
• Ear fullness
• Fatigue and brain fog
• Worsening symptoms after mold exposure

Because MARCoNS creates biofilms (a protective layer), it can be extremely difficult to clear with standard sinus treatments.

Why Mold Illness and MARCoNS Go Together

People with mold exposure or CIRS often have an overactive, exhausted immune system. This makes it easier for MARCoNS to take hold and harder for the body to clear it.

MARCoNS can then:

• Prolong sinus inflammation
• Trigger worsening fatigue and cognitive symptoms
• Interfere with detox pathways
• Keep the inflammation cycle going

This is why treating MARCoNS is often a key step in mold recovery.

How a Compounded Nasal Spray Helps

-At Valley Integrative Health, we use custom-formulated compounded nasal sprays designed to:

1. Break up biofilms

-Special ingredients dissolve the bacterial biofilm so the active medication can reach the source of infection.

2. Reduce inflammation in the sinus passages

-This helps relieve congestion, pressure, and headaches.

3. Target the MARCoNS bacteria directly

Depending on your lab results, the spray may include:

• Antimicrobial agents
• Biofilm disruptors
• Anti-inflammatory ingredients

4. Support long-term healing

By clearing MARCoNS, the immune system can reset, which often leads to better energy, clearer thinking, and fewer mold-related symptoms.

What Treatment Looks Like

• You complete a simple nasal swab test to check for MARCoNS.
• If positive, we prescribe a custom compounded nasal spray.
• Most patients use the spray 2–3 times per day for several weeks.
• As the sinus passages heal, patients often notice improvements in congestion, sleep, headaches, and mold-related symptoms.

The Bottom Line

If you’re dealing with persistent sinus symptoms, fatigue, or mold illness that just won’t improve, MARCoNS may be part of the picture. A targeted compounded nasal spray can safely and effectively help clear the infection so your body can finally heal.

Devin Wilson, ND is a licensed Naturopathic Doctor and Owner of Valley Integrative Health Clinic in Ashland, Oregon. With over a decade of clinical experience including 2 years of training with a Johns Hopkins/Yale Medical Doctor, Dr. Wilson combines naturopathic and modern medicine along with cutting-edge therapies. His enduring goal is to help people re-establish, maintain and optimize their health using a patient-centered and holistic approach.