Borrelia maritima - IgG

What Does a Positive or Elevated IgG Result Mean?

A positive or elevated IgG result for Borrelia maritima suggests:

• Past exposure to B. maritima or a closely related Borrelia species

• The presence of long-lasting antibodies, not necessarily linked to active disease

• Possible cross-reactivity with other Borrelia infections, including Lyme disease

This result does not confirm a current infection, especially in the absence of symptoms or other supporting test findings.

Clinical Relevance

Because Borrelia maritima is not a known human pathogen, a positive or medium IgG result is most likely to represent:

• Environmental exposure (such as through tick bites in coastal areas)

• Cross-reactivity with antibodies produced in response to more clinically relevant Borrelia infections

• A non-specific immune response, not necessarily requiring treatment

If you are experiencing symptoms such as fatigue, joint pain, fever, or neurological issues, your provider will likely focus on more established Borrelia species (e.g., Borrelia burgdorferi, Borrelia miyamotoi) to assess for Lyme disease or relapsing fever.

Next Steps

• Consult your healthcare provider to interpret this result in context with your full medical history, symptoms, and other lab results.

• Further testing (e.g., IgM antibodies, PCR, or specific Lyme disease testing) may be recommended if symptoms suggest a tickborne illness.

• In the absence of symptoms or other abnormal markers, no treatment is usually necessary for an isolated B. maritima IgG finding.

Summary

The Borrelia maritima – IgG test identifies past immune exposure to a lesser-known Borrelia species. A medium or elevated result typically reflects prior contact with the bacterium or cross-reactivity with related pathogens. While this marker is not diagnostic of disease on its own, it may support broader tickborne disease evaluation when combined with symptoms and other test results.

What is Borrelia maritima – IgG?

Borrelia maritima is a lesser-known species within the Borrelia genus—a group of bacteria that includes species responsible for Lyme disease and relapsing fever. B. maritima has been identified in ticks and marine or coastal wildlife, but it is not currently recognized as a confirmed cause of human illness. Its presence on testing panels is typically used to explore environmental exposure to Borrelia species or potential cross-reactivity with more well-studied pathogens, such as Borrelia burgdorferi.

The IgG antibody test for Borrelia maritima detects long-term antibodies that the immune system produces weeks after exposure to the bacterium. IgG antibodies can remain in the blood for months or even years, indicating prior immune system recognition of the organism.

What Does a Medium Result Mean?

A medium IgG result indicates a moderate antibody level, which may reflect:

• Recent or remote past exposure to B. maritima or a related species

• A low-grade or nonspecific immune response

• A borderline result that may not be clinically significant unless accompanied by symptoms or other positive markers