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CIRS: The Biotoxin-Induced Multi-System Inflammatory Condition You've Never Heard Of

You moved into a damp house. Your symptoms started: fatigue so profound you can barely get through the day. Brain fog that makes you forget words mid-sentence. Joint pain that moves around your body. Anxiety that appeared from nowhere. Digestive problems. Hair loss. You go to your GP. Blood work is normal. Thyroid is normal. You're told it's stress or depression. You get antidepressants that don't help.

What actually happened: you were exposed to water-damaged buildings and the mycotoxins they produce. And you have the wrong HLA-DR genotype to clear those toxins efficiently.

This is Chronic Inflammatory Response Syndrome, or CIRS, first formally described by Ritchie Shoemaker in 2010. It's not a psychiatric disorder. It's a measurable inflammatory condition triggered by mycotoxin exposure in genetically susceptible individuals.

The prevalence is higher than you think. Approximately 24% of the North American population carries HLA-DR genotypes that confer susceptibility. In water-damaged building exposure, about 50% of exposed individuals develop CIRS if they carry susceptible HLA-DR types. This means millions of people have CIRS and don't know it.

The Genetics: HLA-DR and Mycotoxin Clearance

Your HLA-DR type determines whether you can effectively present mycotoxins to your immune system for clearance. Some HLA-DR variants can present mycotoxins effectively. Others cannot. People with non-HLA-DR-4-6-53 genotypes (the susceptible ones) cannot mount an effective immune response to mycotoxins. The toxins accumulate. Your innate immune system perceives them as a persistent threat and stays chronically activated.

The result: elevated cytokines (IL-6, TNF-alpha, TGF-beta-1), elevated complement activation, mast cell activation, and a constellation of inflammatory symptoms that mimic autoimmune disease, chronic fatigue syndrome, or fibromyalgia. But it's not. It's a specific, measurable inflammatory response to biotoxins in genetically susceptible people.

If you carry a susceptible HLA-DR type and you've been exposed to a water-damaged building, you need to know this. Your symptoms are not in your head. Your immune system is correctly identifying a threat that your body cannot clear.

Mycotoxin Exposure Routes

Mycotoxins are produced by mould species, particularly Stachybotrys, Aspergillus, Penicillium, and Fusarium. They enter your body through three primary routes:

Inhalation: Spores and mycotoxin-laden particles are inhaled from water-damaged buildings. You breathe them in every day without noticing. Your lungs deposit them. They cross into the bloodstream.

Ingestion: Mould grows on food, particularly grains and nuts. Mycotoxins contaminate the food supply. Rice, peanuts, corn, and wheat are common sources. You ingest small amounts regularly.

Skin contact: Less common but possible through contaminated water or direct contact with heavily mouldy surfaces.

Most exposure comes from water-damaged buildings: basements with water intrusion, leaking roofs, damp crawlspaces, HVAC systems contaminated with mould, AC units that have never been cleaned. UK homes, especially older ones with poor damp-proof courses and inadequate ventilation, are often mould reservoirs.

The Symptom Spectrum: Why It's Mistaken for Other Diseases

CIRS presents with overlapping symptoms that mimic ME/CFS, fibromyalgia, MCS (multiple chemical sensitivity), and autoimmune disease. This is why it's often missed:

These symptoms are non-specific. They overlap with dozens of other conditions. A GP seeing you once a year won't connect them. You need someone trained in CIRS recognition.

Testing for CIRS: The Shoemaker Protocol

Visual Contrast Sensitivity (VCS) Test

The first screening tool is the VCS test—an online test measuring your ability to see subtle contrast gradations. CIRS patients show reduced contrast sensitivity due to neurotoxin effects on the optic nerve and central nervous system. It's not specific, but it's highly sensitive. If you have normal VCS, CIRS is unlikely.

The test is free online (viscontrast.com). It takes 5 minutes. It's the first step.

Inflammatory Markers

If VCS is abnormal, get blood work:

These aren't diagnostic alone. But in context—abnormal VCS + elevated TGF-beta-1 + C4a + suggestive symptoms + water-damaged building exposure history = CIRS is likely.

ERMI and Mycotoxin Testing

ERMI (Environmental Relative Moldiness Index): Your building is tested for mould DNA. An ERMI score above 0 suggests mould burden exceeding the local baseline. This isn't perfect—some buildings test high but cause no problems in most residents—but it quantifies exposure.

Urinary mycotoxin testing: Some labs test urine for mycotoxins (particularly aflatoxins and ochratoxin A). Detection confirms exposure. Absence doesn't exclude CIRS—some exposed individuals don't excrete detectable levels—but presence is confirmatory.

HLA-DR Testing

If you suspect CIRS, knowing your HLA-DR type is informative. Susceptible types (specifically non-HLA-DR-4-6-53 genotypes) support the diagnosis. Non-susceptible types make CIRS very unlikely. Labs like LabCorp and Quest can run HLA typing. It's inexpensive.

Treatment: The Shoemaker Protocol and Beyond

Step 1: Remove the Source

You cannot treat CIRS while remaining in a water-damaged building. Full stop. You must move. You must find living or working space with ERMI scores below 0 and no history of water damage. This is non-negotiable. Everything else is secondary.

Step 2: Binders and Toxin Elimination

Cholestyramine: A prescription bile acid sequestrant that binds mycotoxins in the gut and prevents reabsorption. Standard dose is 4 grams three times daily. It's well-tolerated. Many CIRS practitioners use it as first-line. It works by interrupting the enterohepatic circulation of mycotoxins.

Welchol (colesevelam): A newer bile acid sequestrant with similar mechanism, often preferred for better tolerability.

Activated charcoal or binders: Some practitioners add activated charcoal or other binders, though cholestyramine is the evidence-based choice.

Step 3: Anti-Inflammatory Support

While mycotoxins are bound and excreted, your inflammatory state needs management. Options include:

Step 4: VCS Monitoring and Symptom Tracking

Retest VCS every 4 weeks. As your inflammatory load decreases, VCS improves. This is your objective measure of recovery. Don't rely on subjective feeling alone.

Why Mainstream Medicine Doesn't Recognize CIRS

CIRS exists at the boundary of environmental medicine, immunology, and neurotoxicology. It doesn't fit neatly into traditional disease classification. The NHS doesn't fund CIRS screening or specialist training. Most doctors aren't trained to recognize it. Patients get diagnosed with fibromyalgia or chronic fatigue when CIRS is the actual problem. Treatment happens in the private sector, through practitioners trained in the Shoemaker protocol.

This is changing slowly. Recognition is growing. But for now, if you suspect CIRS, you need to seek a practitioner who specializes in it—usually a functional medicine physician, environmental medicine practitioner, or integrative specialist. The NHS won't diagnose it.