Borrelia miyamotoi and Borrelia californiensis Found in California Ticks
Researchers identified Borrelia miyamotoi in California ticks
Borrelia californiensis was also detected
The findings highlight tick-borne infections beyond Lyme disease
Most people associate tick bites in California with Lyme disease. However, researchers have identified additional Borrelia species in California ticks, including Borrelia miyamotoi and Borrelia californiensis, highlighting the growing diversity of tick-borne infections in the region.
Researchers studying ticks collected in Marin County, California, identified both Borrelia miyamotoi and Borrelia californiensis, organisms that may have implications for human health and tick-borne disease surveillance.
What is Borrelia miyamotoi?
Borrelia miyamotoi is a relapsing fever spirochete transmitted by hard-bodied ticks. Patients infected with Borrelia miyamotoi may experience fever, chills, headache, fatigue, muscle aches, and neurologic symptoms.
Because the symptoms can overlap with Lyme disease and other tick-borne illnesses, diagnosis may be challenging. Unlike Lyme disease, however, Borrelia miyamotoi belongs to the relapsing fever group of Borrelia species.
California Ticks Harbor More Than Lyme Disease
The discovery of Borrelia miyamotoi and Borrelia californiensis highlights the fact that ticks can carry pathogens beyond those responsible for Lyme disease.
Clinicians evaluating patients with tick exposure and compatible symptoms may need to consider a broader range of tick-borne coinfections and infections.
The findings also reinforce the importance of understanding regional differences in tick-borne pathogens. While Lyme disease remains an important concern, emerging organisms may contribute to illness that is not explained by standard Lyme disease testing alone.
What is Borrelia californiensis?
Borrelia californiensis is a Borrelia species identified in California ticks. Although less is known about its role in human disease, its presence demonstrates the diversity of Borrelia organisms circulating in tick populations.
The identification of additional Borrelia species may help explain why some patients with tick exposure develop symptoms that are not easily categorized using current diagnostic approaches.
Implications for Diagnosis
Patients with suspected tick-borne illness may not always fit the classic presentation of Lyme disease. Understanding the range of pathogens carried by ticks can help clinicians broaden their differential diagnosis.
The findings also highlight the limitations of Lyme disease testing, since standard Lyme disease tests are designed to detect antibodies against Borrelia burgdorferi and may not identify every tick-borne infection.
Frequently Asked Questions
What is Borrelia miyamotoi?
Borrelia miyamotoi is a relapsing fever spirochete transmitted by ticks that can cause fever, headache, fatigue, and neurologic symptoms.
What are Borrelia miyamotoi symptoms?
Symptoms may include fever, chills, headache, fatigue, muscle aches, and, in some cases, neurologic manifestations.
Is Borrelia miyamotoi found in California?
Yes. Researchers have identified Borrelia miyamotoi in ticks collected in California, including Marin County.
How is Borrelia miyamotoi different from Lyme disease?
Borrelia miyamotoi belongs to the relapsing fever group of Borrelia species, whereas Lyme disease is primarily caused by Borrelia burgdorferi.
Clinical Takeaway
The identification of Borrelia miyamotoi and Borrelia californiensis in California ticks highlights the growing diversity of tick-borne pathogens.
These findings remind clinicians and patients that tick-borne infections extend beyond Lyme disease and may require broader diagnostic consideration in individuals with tick exposure and compatible symptoms.
Related Articles
Borrelia miyamotoi: symptoms, diagnosis, and treatment
Tick-borne coinfections and Lyme disease
Why Lyme disease tests can miss infections
Lyme disease symptoms guide
References
- Padgett KA, Bonilla DL, Kjemtrup AM, Vilcins IME, Yoshimizu MH, Hui LT, Sola M, Quintana M, Kramer VL. “Investigation of Borrelia miyamotoi, Borrelia burgdorferi, and Borrelia californiensis in Ixodes pacificus ticks collected from California.” Vector-Borne and Zoonotic Diseases.
Dr. Daniel Cameron, MD, MPH
Lyme disease clinician with over 30 years of experience and past president of ILADS.
Symptoms • Testing • Coinfections • Recovery • Pediatric • Prevention
