Persistent Symptoms After Lyme Treatment? Don’t Overlook Babesia
Persistent symptoms may have more than one explanation.
Babesia can occur in otherwise healthy individuals.
Recognizing coinfection may help guide further evaluation and treatment.
She wasn’t immunocompromised. So why was she still experiencing persistent symptoms after Lyme treatment?
That was the question we kept coming back to.
She’d been told Babesia wouldn’t be a problem—unless she had a weakened immune system. She didn’t. But she was still dealing with fatigue, air hunger, night sweats, and brain fog long after her Lyme disease treatment ended.
And that’s when we looked closer.
We considered whether an overlooked Babesia coinfection could explain her persistent symptoms.
Could Persistent Symptoms Mean Babesia Was Missed?
A common assumption has been that Babesia primarily causes significant illness in people with compromised immune systems. However, the clinical reality is more complicated.
Symptomatic Babesia infections can—and do—occur in immunocompetent patients.
In this case, my patient had gone untreated for months. When she finally received Babesia-specific therapy—a combination of atovaquone and azithromycin—her symptoms began to lift. Her progress was slow but steady, and for the first time in months, she started to feel like herself again.
What Babesia Looks Like in Real Life
Babesia is a malaria-like parasite transmitted by the blacklegged tick, the same tick that spreads Lyme disease. It infects red blood cells and may occur alone or together with Lyme disease. Because many symptoms overlap, Babesia is often overlooked unless classic features are recognized.
Some common Babesia signs include:
- Drenching night sweats
- Shortness of breath (air hunger)
- Persistent fatigue
- Dizziness or feeling “off”
- Brain fog and poor concentration
- Mood changes or panic-like sensations
Persistent symptoms after doxycycline alone should raise the possibility of Babesia because doxycycline does not reliably treat babesiosis. When fatigue, air hunger, drenching night sweats, or brain fog continue despite appropriate Lyme disease treatment, clinicians should consider whether Babesia testing or Babesia-directed therapy is appropriate.
For a broader discussion of diagnosis and treatment, see our Babesia guide.
When Lyme treatment fails or stalls, coinfections like Babesia should remain on the differential diagnosis. Dismissing Babesia based on immune status alone may delay diagnosis and recovery.
Frequently Asked Questions
Can Babesia occur in healthy people?
Yes. Although severe babesiosis is more common in older adults or people with weakened immune systems, symptomatic Babesia infection can also occur in otherwise healthy individuals.
Does doxycycline treat Babesia?
No. Doxycycline is commonly used to treat Lyme disease but is not considered adequate treatment for babesiosis. Babesiosis typically requires antiparasitic therapy such as atovaquone combined with azithromycin or other appropriate regimens.
Why do symptoms sometimes persist after Lyme treatment?
Persistent symptoms after Lyme treatment may have several explanations, including an unrecognized Babesia coinfection. Persistent fatigue, air hunger, drenching night sweats, and brain fog should prompt consideration of additional evaluation when clinically appropriate.
Clinical Takeaway
My patient’s turning point came when we considered that Babesia—not persistent Lyme disease alone—might explain her ongoing symptoms.
Although severe babesiosis is more common in individuals with impaired immunity, symptomatic Babesia infection can also occur in otherwise healthy people. Recognizing Babesia as a possible cause of persistent symptoms after Lyme treatment may lead to appropriate evaluation and treatment.
Persistent symptoms deserve a careful reassessment rather than assumptions based solely on immune status.
Related Articles
Babesia and Lyme: It’s Worse Than You Think
When Lyme Treatment Fails: Could It Be Babesia?
Chronic Babesia: Can Symptoms Persist?
References
- Vannier E, Krause PJ. Human babesiosis. N Engl J Med. 2012;366(25):2397-2407. doi:10.1056/NEJMra1202018.
- Krause PJ, Auwaerter PG, Bannuru RR, et al. Clinical practice guidelines by the Infectious Diseases Society of America (IDSA): 2020 guideline on diagnosis and management of babesiosis. Clin Infect Dis. 2021;72(2):e49-e64. doi:10.1093/cid/ciaa1216.
- Kumar A, O’Bryan J, Krause PJ. The global emergence of human babesiosis. Pathogens. 2021;10(11):1447. doi:10.3390/pathogens10111447.
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
