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Lyme disease, bartonellosis, and babesiosis can produce substantial immune-system disturbances. However, an important distinction is necessary: immune activation, inflammation, and autoimmunity are not synonymous.
Lyme has the strongest evidence for infection-associated autoimmunity among these organisms concerns Borrelia burgdorferi, particularly antibiotic-refractory Lyme arthritis (often termed post-antibiotic Lyme arthritis).
Bartonella has documented associations with immune-mediated manifestations, including glomerulonephritis and autoantibody production.
Babesia produces important inflammatory, hemolytic, and complement-related effects, but evidence that it directly initiates classical autoimmune disease in humans is considerably more limited.
The following 30 mechanisms include established observations, plausible biological pathways, and hypotheses requiring further research. The evidence level is identified to avoid treating every mechanism as proven.
I. Molecular Mimicry and Loss of Immune Tolerance
1. Molecular mimicry between bacterial and human proteins. Borrelia antigens may resemble human proteins sufficiently to encourage cross-reactive immune responses. Cross-reactivity involving outer surface protein A (OspA) and human LFA-1 was investigated in treatment-resistant Lyme arthritis. Subsequent research suggests the disease mechanism is more complex than a single cross-reactive antigen. Evidence: Human mechanistic studies.
2. Immune responses against human LFA-1. Certain T-cell responses directed against Borrelia OspA have shown reactivity with human leukocyte function-associated antigen-1 sequences. This provides a specific example of potential molecular mimicry, although its clinical importance remains debated. Evidence: Experimental human T-cell studies.
3. Autoimmune responses against endothelial cell growth factor (ECGF). ECGF has been identified as an autoantigen in some patients with Lyme arthritis. Such responses may help maintain synovial inflammation after antimicrobial treatment. Evidence: Human clinical and laboratory studies.
4. Autoimmunity against matrix metalloproteinase-10 (MMP-10). MMP-10 has been identified as an autoantigen associated with inflammatory responses in Lyme arthritis. The association suggests that tissue remodeling proteins can become targets of abnormal immunity. Evidence: Human mechanistic research.
5. Loss of immune tolerance after prolonged infection-associated inflammation. Persistent inflammatory signaling can interfere with mechanisms that normally prevent immune responses against self-antigens. This is a general pathway toward autoimmunity and is plausible in inflammatory Borrelia disease, but is not proven as a universal consequence of these three infections. Evidence: General immunology and indirect infection-specific evidence.
II. Abnormal Innate Immune Activation
6. Toll-like receptor 2 activation. Borrelia lipoproteins stimulate TLR2-dependent pathways, promoting inflammatory mediators. Persistent or excessive innate immune activation may create conditions favoring autoreactive immune responses. Evidence: Strong experimental evidence for inflammation; indirect for autoimmunity.
7. TLR1/TLR2 genetic susceptibility. A functional TLR1 polymorphism has been associated with heightened inflammatory responses and antibiotic-refractory Lyme arthritis. Host genetics may therefore help explain why some infected individuals develop unusually prolonged joint inflammation. Evidence: Human genetic association.
8. Excessive interferon-gamma signaling. Interferon-gamma and Th1-associated responses can intensify inflammatory activity in Lyme arthritis. This may promote antigen presentation and local tissue injury. Evidence: Human inflammatory studies; autoimmune contribution plausible.
9. Type I interferon dysregulation. Borrelia infection can activate type I interferon pathways. Such pathways are implicated in several autoimmune diseases, but whether Borrelia-induced type I interferon activity independently causes autoimmune disease is unestablished. Evidence: Experimental and indirect.
10. Complement activation and immune injury. Borrelia, Bartonella, and Babesia interact with complement in different ways. Excessive complement activation can contribute to inflammatory tissue damage, while complement consumption may accompany infection-related immune-complex disease. Complement activation alone does not demonstrate autoimmunity. Evidence: Established immune biology; variable disease-specific relevance.
III. Adaptive Immune Dysregulation and Autoantibody Formation
11. Inadequate regulatory T-cell activity. Regulatory T cells normally suppress autoreactive immune responses. Post-antibiotic Lyme arthritis has been associated with an abnormal balance between regulatory and effector T cells in synovial tissue. Evidence: Human Lyme arthritis studies.
12. Insufficient interleukin-10 activity. IL-10 limits excessive inflammatory signaling. Inadequate IL-10 relative to proinflammatory cytokines may contribute to persistent synovitis and a local environment favorable to autoimmune responses. Evidence: Human and experimental Lyme studies.
13. HLA-DR genetic susceptibility. Certain HLA-DR alleles present Borrelia peptides efficiently to T cells and are associated with post-antibiotic Lyme arthritis. Genetic susceptibility may influence which individuals develop prolonged inflammatory or autoimmune responses. Evidence: Human genetic and immunologic studies.
14. Abnormal B-cell activation. Infection-associated B-cell activation may encourage antibody responses against host antigens. Lyme arthritis studies have identified several self-proteins targeted by B-cell and T-cell responses. Evidence: Human studies for Borrelia; less direct evidence for Bartonella and Babesia.
15. Epitope spreading. An immune response initially directed at microbial antigens may expand to additional self-antigens released during tissue inflammation. This is a plausible explanation for the diversity of autoantigens identified in Lyme synovial tissue, although the complete sequence of events has not been demonstrated. Evidence: Mechanistic hypothesis supported by human autoantigen studies.
16. Autoimmunity against apolipoprotein B-100. ApoB-100 is another identified autoantigen in Lyme arthritis. Immune recognition of this protein may be relevant to inflammatory changes involving blood vessels and synovial tissue. Evidence: Human T-cell and antibody studies.
17. Autoimmunity against annexin A2. Annexin A2 is involved in cellular membrane organization and vascular biology. It has been identified as a target of autoimmune responses in Lyme arthritis and other inflammatory diseases. Evidence: Human mechanistic studies.
18. Immune responses against synovial extracellular matrix proteins. Research has identified self-peptides derived from extracellular matrix proteins presented by HLA-DR molecules in Lyme synovial tissue. These may contribute to the maintenance of local autoreactive T-cell responses. Evidence: Human immunopeptidomics research.
IV. Bartonella-Associated Immune Mechanisms
19. Antineutrophil cytoplasmic antibody (ANCA) formation. Bartonella endocarditis may be accompanied by ANCA positivity, including antibodies that resemble those found in primary autoimmune vasculitis. A 2025 clinicopathologic study reported ANCA positivity in approximately 67% of its Bartonella-associated infection-related glomerulonephritis cases. Evidence: Human clinical studies; autoantibody formation established, pathogenic significance variable.
20. Antinuclear antibody (ANA) production. Bartonella-associated endocarditis can produce ANA positivity, potentially mimicking systemic autoimmune disorders. In the same 2025 study, ANA positivity occurred in approximately 53% of Bartonella-associated cases. Evidence: Human clinical studies.
21. Immune-complex deposition in the kidneys. Bartonella endocarditis may produce circulating immune complexes that deposit in glomeruli, activating complement and causing kidney inflammation. This is more accurately classified as infection-related immune-complex disease than necessarily as primary autoimmunity. Evidence: Human renal pathology.
22. Complement consumption and hypocomplementemia. Complement activation in Bartonella-associated glomerulonephritis can lower circulating complement levels. The resulting laboratory picture may resemble lupus nephritis or immune-complex vasculitis. Evidence: Human clinical and biopsy studies.
23. Cryoglobulin-associated immune abnormalities. Some patients with Bartonella endocarditis develop cryoglobulinemia, potentially contributing to vascular and renal inflammation. The 2025 study reported cryoglobulinemia in approximately 45% of Bartonella-associated cases. Evidence: Human clinical studies.
24. Vasculitis-like inflammatory injury. Bartonella-associated glomerulonephritis can exhibit crescent formation and, occasionally, a pauci-immune pattern resembling ANCA-associated vasculitis. The critical distinction is that infection may be driving the process rather than a primary autoimmune disorder. Evidence: Human clinicopathologic studies.
V. Babesia-Associated Immune Abnormalities
25. Autoimmune hemolytic anemia following babesiosis. Warm autoimmune hemolytic anemia has been reported during or after babesiosis. In these cases, antibodies directed against red blood cells may cause hemolysis beyond direct parasite-mediated erythrocyte destruction. Evidence: Human case reports and small case series; uncommon complication.
26. Red blood cell antigen exposure during infection. Babesia damages infected erythrocytes and produces substantial red-cell destruction. Exposure of cellular components during hemolysis could theoretically favor immune recognition of altered or normally concealed host antigens. However, this mechanism has not been established as a cause of systemic autoimmunity in human babesiosis. Evidence: Established hemolytic biology; autoimmune link hypothetical.
27. Complement-associated erythrocyte injury. Complement participates in immune responses and can contribute to antibody-mediated hemolysis. When autoimmune hemolytic anemia occurs in a patient with babesiosis, complement involvement should be evaluated separately from direct parasitic hemolysis. Evidence: Established hematologic mechanisms; limited Babesia-specific autoimmune data.
28. Inflammatory cytokine amplification. Babesia infection can induce systemic inflammatory responses, especially in severe disease. Elevated inflammatory signaling may theoretically increase autoreactive immune-cell activation, but there is insufficient evidence that this commonly produces lasting autoimmune disease. Evidence: Babesia-associated inflammation established; autoimmune consequence speculative.
VI. Mechanisms Potentially Shared by All Three Infections
29. Tissue injury and release of self-antigens. Borrelia-associated synovitis, Bartonella-associated vascular or renal injury, and Babesia-associated hemolysis can release host cellular material. In principle, this may promote epitope spreading and secondary autoimmune responses in susceptible individuals. Evidence: Tissue injury established; common autoimmune pathway not proven across all three organisms.
30. Failure to terminate inflammatory responses after the original trigger subsides. Post-antibiotic Lyme arthritis illustrates how inflammation may persist despite microbiologic treatment. Host genetic susceptibility, regulatory-cell imbalance, and responses against self-antigens may contribute. Whether comparable self-sustaining autoimmune pathways explain chronic symptoms after Bartonella or Babesia infection remains uncertain. Evidence: Strongest for post-antibiotic Lyme arthritis; speculative for the other infections.
Comparative Summary
| Mechanism | Borrelia | Bartonella | Babesia |
|---|---|---|---|
| Molecular mimicry | Studied in humans | Limited evidence | Not established |
| Self-directed T-cell responses | Documented in Lyme arthritis | Limited evidence | Not established |
| Autoantibody production | Documented | Documented | Documented in rare hemolytic cases |
| Immune-complex disease | Possible | Well documented in endocarditis | Limited evidence |
| ANCA-associated findings | Not a characteristic mechanism | Documented | Not characteristic |
| Autoimmune hemolytic anemia | Not characteristic | Rarely reported | Reported |
| Complement-mediated inflammation | Documented | Documented | Relevant to hemolytic complications |
| Persistent postinfectious immune dysregulation | Documented in Lyme arthritis | Uncertain | Uncertain |
Important clinical implication: A positive ANA, ANCA, or other autoantibody result during an infection does not, by itself, establish a primary autoimmune disease. In particular, occult Bartonella endocarditis must be considered when a patient has ANCA positivity, glomerulonephritis, and compatible infectious findings. Immunosuppression without recognizing the infection may be hazardous.
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Sample References
1. Gross DM, Forsthuber T, Tary-Lehmann M, Etling C, Ito K, Nagy ZA, Field JA, Steere AC, Huber BT. Identification of LFA-1 as a candidate autoantigen in treatment-resistant Lyme arthritis. Science. 1998;281(5377):703–706. DOI: 10.1126/science.281.5377.703.
2. Steere AC, Gross D, Meyer AL, Huber BT. Autoimmune mechanisms in antibiotic treatment-resistant Lyme arthritis. Journal of Autoimmunity. 2001;16(3):263–268. DOI: 10.1006/jaut.2000.0495.
3. Drouin EE, Seward RJ, Strle K, McHugh G, Katchar K, Londoño D, Yao C, Costello CE, Steere AC. A novel human autoantigen, endothelial cell growth factor, is a target of T and B cell responses in patients with Lyme disease. Arthritis & Rheumatism. 2013;65(1):186–196. DOI: 10.1002/art.37732.
4. Crowley JT, et al. Matrix metalloproteinase-10 is a target of T and B cell responses that correlate with synovial pathology in patients with antibiotic-refractory Lyme arthritis. Journal of Autoimmunity. 2016. Full article
5. Arvikar SL, Steere AC. Lyme arthritis. Infectious Disease Clinics of North America. 2022. Full article
6. Kanjana K, Strle K, Lochhead RB, Pianta A, Mateyka LM, Wang Q, Arvikar SL, Kling DE, Deangelo CA, Curham L, Barbour AG, Costello CE, Moon JJ, Steere AC. Autoimmunity to synovial extracellular matrix proteins in patients with postinfectious Lyme arthritis. Journal of Clinical Investigation. 2023;133(17):e161170. DOI: 10.1172/JCI161170.
7. Bartonella Endocarditis-Associated Glomerulonephritis: A Mimicker of Autoimmunity and Vasculitis. 2025. PMID: 40303199. PubMed
8. Strle K, Shin JJ, Glickstein LJ, Steere AC. Association of a Toll-like receptor 1 polymorphism with heightened Th1 inflammatory responses and antibiotic-refractory Lyme arthritis. Arthritis & Rheumatism. 2012. DOI: 10.1002/art.34383.
9. Williams MA, Hernandez SA, Arvikar SL, Sulka KB, Strle F, Wells CC, Petnicki-Ocwieja T, Steere AC, Strle K. Toll-like receptor 1 polymorphism is associated with impaired immune tolerance, dysregulated inflammatory responses to Borrelia burgdorferi, and heightened risk of post-infectious Lyme arthritis. Frontiers in Immunology. 2025;16:1711765. DOI: 10.3389/fimmu.2025.1711765.