5 Infections Linked to Autoimmune Disease (And What Your Gut Has to Do With It)

By Baldomero Garza, Co-Founder, MSW Nutrition

The Infections and Autoimmune Disease Connection Nobody Is Talking About

You got sick. You recovered. But something felt different afterward.

Maybe it was joint pain that came out of nowhere. A food sensitivity that wasn’t there before. Brain fog that won’t lift no matter how much you sleep. Or labs that keep coming back “normal” while your body keeps telling you something is wrong.

Here’s what most people are never told: certain infections don’t just pass through your system. They change the way your immune system behaves — sometimes for years, sometimes permanently.

Emerging research is now connecting the dots between past infections and autoimmune disease in ways that are fundamentally shifting how we understand immune health. These aren’t fringe theories. They’re backed by peer-reviewed science published in some of the world’s leading medical journals.

The mechanism researchers keep returning to is called molecular mimicry. When a pathogen’s proteins closely resemble the proteins of your own tissue, your immune system — trained to destroy the invader — can begin attacking the wrong target. The infection becomes a case of mistaken identity with long-term consequences.

Understanding your autoimmune triggers might be the missing piece you’ve been looking for. Start with these five infections — and what the science actually says about each one.

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#5: COVID-19 and Autoimmune Disease Risk

COVID-19 isn’t just a respiratory event. Research published in leading immunology journals confirms that SARS-CoV-2 significantly increases the risk of autoimmune disease, particularly conditions affecting vascular and connective tissue. The virus triggers a state of immune hyperstimulation — including cytokine release syndrome — that can persist long after the acute infection is gone.

Women between the ages of 30 and 50 face a disproportionate risk, both for long COVID and for the autoimmune consequences that follow. Studies have also detected significant levels of autoantibodies in people infected with SARS-CoV-2 — antibodies that, in some cases, begin attacking the body’s own tissue.

The neurological damage associated with COVID, including the widespread loss of taste and smell, points to the virus’ ability to infiltrate and persist within the nervous system. This is why the connection between COVID and autoimmune disease is one of the most actively studied areas in immunology today.

If you experienced a COVID infection and haven’t felt the same since, this science provides important context — and a strong case for supporting your gut barrier as part of your recovery. Learn more about strengthening your immune system →

#4: Herpes Simplex Virus (HSV) and Neurological Autoimmune Risk

HSV isn’t just associated with cold sores or genital outbreaks. Peer-reviewed research has established compelling links between herpes simplex infections and both Alzheimer’s disease and Parkinson’s disease. After entering the central nervous system, HSV drives inflammatory responses that increase amyloid beta plaque formation — a hallmark of Alzheimer’s — while also stimulating tumor necrosis factor activity that accelerates the death of dopaminergic neurons.

One study found that individuals with elevated HSV antibodies faced more than double the risk of developing dementia later in life. The virus can remain dormant in the nervous system for decades before an immune stressor — illness, a major surgery, chronic stress — reactivates it.

This is the part that most people miss: HSV isn’t truly dormant. It’s managing a constant negotiation with your immune system. When that immune system is weakened — often starting in the gut — the virus gains an advantage.

#3: Staph Infections (S. aureus) and the Gut Microbiome

An estimated one-third of the human population carries Staphylococcus aureus at any given point — in the gut, on the skin, in the sinuses — without any symptoms. But research increasingly links staph colonization and infection to rheumatoid arthritis, lupus, and other autoimmune conditions.

The pathway runs directly through the gut microbiome. When staph disrupts the delicate ratio of beneficial to pathogenic bacteria in the gut, it initiates a cascade of innate immune dysregulation. Studies comparing germ-free and pathogen-colonized animal models have confirmed the gut microbiota’s profound influence on the development of autoimmune disease.

Staph isn’t just a skin problem — it’s a systemic autoimmune trigger with a gut microbiome footprint. And the more we learn about how gut bacteria regulate immune identity, the more central this connection becomes.

#2: Epstein-Barr Virus (EBV) — The Silent Autoimmune Activator

Most people encounter EBV as teenagers — it’s the virus behind mononucleosis. But EBV never fully leaves. It goes dormant in immune cells and can reactivate under stress, acting as one of the most well-documented autoimmune triggers in current research.

Scientists have now connected EBV to the development of multiple sclerosis, rheumatoid arthritis, and Alzheimer’s disease. EBV has been found in the blood of Alzheimer’s patients, where it’s associated with cognitive decline and disease progression.

Research from Stanford University confirmed that EBV infection can trigger MS by generating antibodies that cross-react with a protein critical to the nervous system. “We’re finally starting to gain insights into what actually causes these very prevalent autoimmune diseases,” noted one Stanford researcher whose work helped make this connection.

If you had mono as a teenager — or have been told you have high EBV antibodies — the implications for your current immune health are significant, and grounded in peer-reviewed science.

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#1: Strep Infections — The Most Underrecognized Autoimmune Trigger

Strep is the most underrecognized infections and autoimmune disease connection on this list — and arguably the most consequential. Beyond its well-documented link to acute rheumatic fever, streptococcal infections have been directly connected to a neurological autoimmune disorder called PANDAS: Pediatric Autoimmune Neuropsychiatric Disorders Associated with Streptococcal Infections.

PANDAS is characterized by sudden, dramatic behavioral and neurological changes following strep infection — including OCD, anxiety, tics, cognitive regression, and personality changes. It is molecular mimicry in its most visible form. The immune system, trained to attack strep proteins, begins attacking brain tissue that looks similar.

Strep also appears to increase the relative abundance of bacteria associated with primary biliary cirrhosis, and research suggests a role in liver-specific autoimmune reactions linked to molecular mimicry between bacterial antigens and human tissue.

The research is also drawing a clear line between chronic strep infections and oral microbiome disruption that reaches directly to the brain — a connection that dentists, and increasingly neurologists, are beginning to take seriously. See how autoimmune conditions are managed through lifestyle approaches →

Why the Gut Is the Common Thread in Infections and Autoimmune Disease

What ties all five of these infections together isn’t just their ability to trigger autoimmune responses — it’s where that damage happens. The gut.

An estimated 70–80% of the body’s immune cells reside in the gut. When the gut microbiome is disrupted — through repeated antibiotic use, processed foods, chronic infections, or sustained stress — the immune system loses its regulatory foundation. It becomes reactive, dysregulated, and in many cases, self-directed.

Research confirms that microbiome dysregulation contributes to conditions including rheumatoid arthritis, lupus, type 1 diabetes, and inflammatory bowel disease. Fecal transplant studies have demonstrated that transferring gut bacteria from autoimmune-prone animals can actually induce autoimmune responses in healthy ones — a striking demonstration of how central gut ecology is to immune identity.

When infections damage the gut lining, they create the conditions for “leaky gut” — a state in which pathogens, toxins, and undigested proteins pass directly into the bloodstream, eventually reaching the liver, the heart, and the brain. This is the biological pathway that connects a childhood strep infection or a dormant Epstein-Barr virus to neurological dysfunction years later.

This is also why supporting liver function is a critical but often overlooked piece of immune health. The liver filters blood coming directly from the gut. When the gut leaks, the liver takes the hit first — and a burdened liver means a less effective immune system.

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What You Can Do Right Now

Supporting your immune system after a history of infections doesn’t have to be complicated. Here are the foundational steps — grounded in the same research covered above:

• Repair the gut lining with L-Glutamine (Gut by MSW Nutrition) — start with 2–4g per day on an empty stomach
• Address Vitamin D deficiency — consistently found in autoimmune patients; 5,000 IU daily is a reasonable starting point
• Support liver detoxification — the liver filters blood coming directly from the gut; liver function is immune function
• Reduce gut-disrupting inputs — processed foods, excess alcohol, and unnecessary antibiotics all compound microbiome damage
• Ask better questions — if you’ve had chronic strep, mono, long COVID, or shingles, these deserve a serious autoimmune conversation with your provider

The research connecting infections and autoimmune disease is still emerging — but the foundational steps for protecting yourself are already clear. They start in the gut.

👉 Start healing your gut today →

References

1. Autoimmune Diseases — Environmental Triggers and Chronic Viral Infections
2. Autoimmune Diseases — Cleveland Clinic
3. COVID-19 and Autoimmune Disease Risk
4. Autoimmunity as a Driver of Long COVID — Yale Medicine
5. SARS-CoV-2 Autoimmune and Autoinflammatory Responses
6. Herpes Simplex Virus, Alzheimer’s, and Parkinson’s Disease
7. Bacterial Infections and Autoimmune Disease Development
8. Gut Microbiota and Innate Immunity in Autoimmune Diseases
9. Staphylococcus aureus in the Human Microbiome
10. Epstein-Barr Virus — NIH Overview
11. Microbial Triggers of Autoimmune Disease — Stanford Medicine
12. Epstein-Barr Virus and Autoimmune Diseases — NIH Research Matters
13. EBV and Cognitive Decline in Alzheimer’s Disease
14. Strep Infections and Autoimmune Disease / PANDAS
15. Understanding PANDAS — PANDAS Network

Frequently Asked Questions