Autoimmune Triggers: 5 Past Infections That May Still Be Attacking Your Body

By Baldomero Garza, Co-Founder, MSW Nutrition

You got sick. You recovered. But something felt different afterward — joint pain out of nowhere, a new food sensitivity, brain fog that won't lift, or labs that keep coming back "normal" while your body keeps telling you something is wrong. Increasingly, the research points to a single overlooked culprit: autoimmune triggers hiding in your own health history. Certain past infections don't simply pass through your system — they can reprogram how your immune system behaves for years.

The Autoimmune Triggers Hidden in Your Health History

Autoimmune disorders affect an estimated 50 million Americans, yet for most the root cause is never identified. What the research consistently reveals is that past infections — the ones often dismissed as fully resolved — are among the most significant autoimmune triggers in existence.

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. The damage frequently routes through the gut, which is why protecting the intestinal barrier matters so much (more on that in our Wellness Hub and on the Gut L-Glutamine page).

5 Infections That May Have Reprogrammed Your Immune System

#5 — COVID-19

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 clears. Women between 30 and 50 face a disproportionate risk for both long COVID and 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.

#4 — Herpes Simplex Virus (HSV)

HSV isn't just about cold sores. Peer-reviewed research has established compelling links between herpes simplex infections and both Alzheimer's and Parkinson's disease. After entering the central nervous system, HSV drives inflammatory responses that increase amyloid beta plaque formation while 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 stay dormant for decades before an immune stressor — illness, surgery, chronic stress — reactivates it.

#3 — Staph Infections (S. aureus)

An estimated one-third of people carry Staphylococcus aureus at any given point — in the gut, on the skin, in the sinuses — without symptoms. But research increasingly links staph colonization to rheumatoid arthritis, lupus, and other autoimmune conditions, and the pathway runs directly through the gut microbiome. When staph disrupts the balance of beneficial to pathogenic bacteria, it initiates a cascade of innate immune dysregulation. Germ-free versus pathogen-colonized animal studies confirm the gut microbiota's profound influence on autoimmune development.

#2 — Epstein-Barr Virus (EBV)

Most people meet EBV as teenagers — it's the virus behind mononucleosis — but it never fully leaves. It goes dormant in immune cells and can reactivate under stress, making it one of the most well-documented autoimmune triggers in current research. Scientists have connected EBV to multiple sclerosis, rheumatoid arthritis, and Alzheimer's. 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 — a textbook case of molecular mimicry.

#1 — Strep Infections

Strep is the most underrecognized — and arguably most consequential — autoimmune trigger on this list. Beyond its link to acute rheumatic fever, streptococcal infections are directly connected to PANDAS (Pediatric Autoimmune Neuropsychiatric Disorders Associated with Streptococcal Infections), characterized by sudden OCD, anxiety, tics, and cognitive regression following infection. It is molecular mimicry in its most visible form. Strep is also being linked to oral microbiome disruption that reaches directly to the brain — a connection dentists and neurologists are beginning to take seriously.

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Why the Gut Is the Common Thread Behind Autoimmune Triggers

What ties all five infections together isn't just their ability to provoke an autoimmune response — it's where the damage happens. An estimated 70–80% of the body's immune cells reside in the gut. When the gut microbiome is disrupted — through repeated antibiotics, processed foods, chronic infections, or sustained stress — the immune system loses its regulatory foundation and becomes reactive, dysregulated, and in many cases self-directed.

Research confirms that microbiome dysregulation contributes to rheumatoid arthritis, lupus, type 1 diabetes, and inflammatory bowel disease. Fecal transplant studies have even shown that transferring gut bacteria from autoimmune-prone animals can induce autoimmune responses in healthy ones. When infections damage the gut lining, they create the conditions for "leaky gut" — where pathogens, toxins, and undigested proteins pass into the bloodstream and eventually reach the liver, heart, and brain. That is the biological pathway connecting a childhood strep infection or a dormant Epstein-Barr virus to neurological dysfunction years later.

If the gut barrier is where autoimmune triggers do their damage, start by reinforcing it. 4g of L-Glutamine per scoop, one scoop on an empty stomach.

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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. These foundational steps are grounded in the same research covered here:

• Repair the gut lining with L-Glutamine (Gut by MSW Nutrition) — start with 2–4g per day and work up.
• 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.

References

1. Autoimmune Diseases — Environmental Triggers and Chronic Viral Infections. PMC10051805
2. Autoimmune Diseases — Cleveland Clinic. clevelandclinic.org
3. COVID-19 and Autoimmune Disease Risk. Springer
4. Autoimmunity as a Driver of Long COVID — Yale Medicine. yale.edu
5. SARS-CoV-2 Autoimmune and Autoinflammatory Responses. PMC9350728
6. Herpes Simplex Virus, Alzheimer's, and Parkinson's Disease. PMC10818483
7. Bacterial Infections and Autoimmune Disease Development. PubMed 28919485
8. Gut Microbiota and Innate Immunity in Autoimmune Diseases. PMC11099291
9. Staphylococcus aureus in the Human Microbiome. PMC9791742
10. Epstein-Barr Virus — NIH Overview. NBK459437
11. Revealing Microbial Triggers of Autoimmune Disease — Stanford Medicine. stanford.edu
12. Epstein-Barr Virus and Autoimmune Diseases — NIH Research Matters. nih.gov
13. EBV and Cognitive Decline in Alzheimer's Disease. PMC8784775
14. Strep Infections and Autoimmune Disease / PANDAS. PMC10920276
15. Understanding PANDAS — PANDAS Network. pandasnetwork.org

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*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.