Chronic Babesia: Why Some Infections Relapse Despite Treatment
Chronic Babesia may persist despite treatment
Immunocompromised patients face higher relapse risk
Persistent parasitemia may require prolonged therapy
Chronic Babesia can be difficult to eradicate in some patients, particularly those who are immunocompromised or have underlying hematologic disorders.
While many individuals improve with standard therapy, others experience recurrent fatigue, fevers, anemia, and persistent parasitemia despite repeated treatment courses.
In the article Failure of an Approximately Six Week Course of Tafenoquine to Completely Eradicate Babesia microti Infection in an Immunocompromised Patient, Prasad and Wormser describe a chronic relapsing Babesia microti infection in an elderly immunocompromised woman. [1]
Why Babesia May Relapse
Relapsing babesiosis is most commonly described in patients with impaired immune function.
Risk factors for chronic or persistent infection may include:
- Advanced age
- Immunosuppressive therapy
- Hematologic malignancy
- Asplenia
- Autoimmune disease
Some patients may initially improve but later develop recurrent parasitemia, anemia, fevers, fatigue, or hemolysis.
Persistent infection may reflect difficulty fully clearing intraerythrocytic parasites despite antimicrobial therapy.
Persistent Parasitemia Can Complicate Recovery
The patient described in the report had diffuse large B-cell lymphoma treated with chemotherapy, polymyalgia rheumatica treated with prednisone, and autoimmune hemolytic anemia.
A peripheral blood smear confirmed Babesia microti infection with parasitemia. Her hemoglobin dropped to 6.5 g/dL, requiring multiple blood transfusions.
Although she initially improved with azithromycin and atovaquone, her symptoms and parasitemia later recurred.
Clinicians attempted multiple antimicrobial regimens over time, including:
- Azithromycin plus atovaquone
- Clindamycin
- Quinine plus oral clindamycin
- Tafenoquine
- Malarone combined with azithromycin and atovaquone
Severe Babesia May Require Escalated Care
Patients with severe or relapsing babesiosis may require prolonged antimicrobial therapy and close laboratory monitoring.
Some individuals with severe hemolysis or high-grade parasitemia may require blood transfusion or exchange transfusion.
Complications may include:
- Severe anemia
- Hemolysis
- Organ dysfunction
- Persistent fatigue
- Recurrent fevers
These complications are more commonly described in immunocompromised patients and older adults.
Quinine Toxicity Limited Therapy
The patient later developed symptoms consistent with cinchonism while receiving quinine therapy.
Reported side effects included:
- Hearing loss
- Vertigo
- Tinnitus
These symptoms resolved after quinine was discontinued.
Tafenoquine in Relapsing Babesia
The patient was later treated with tafenoquine after testing negative for glucose-6-phosphate dehydrogenase deficiency.
Although her anemia and transfusion requirements initially improved, therapy was later discontinued because of neutropenia, followed by recurrence of parasitemia and symptoms.
For additional discussion of tafenoquine in relapsing infection, see Tafenoquine: Treatment for relapsing Babesia.
Babesia and Tick-Borne Co-Infections
Babesia may overlap with other tick-borne co-infections, complicating diagnosis, treatment, and recovery.
Persistent fatigue, sweats, cognitive symptoms, and autonomic complaints may overlap with Lyme disease and other co-infections.
Frequently Asked Questions
What is chronic Babesia?
Chronic Babesia refers to persistent or relapsing babesiosis despite treatment.
Who is most at risk for relapsing Babesia?
Immunocompromised patients, elderly individuals, and patients without a functioning spleen are at highest risk.
Can Babesia relapse after treatment?
Yes. Some patients experience recurrent parasitemia and symptoms after initial improvement.
What symptoms may return with chronic Babesia?
Fatigue, fevers, anemia, night sweats, and hemolysis may recur.
Can severe Babesia require transfusion?
Yes. Severe babesiosis may require blood transfusion or exchange transfusion in some patients.
Clinical Takeaway
Chronic Babesia can relapse despite standard therapy, particularly in immunocompromised patients.
Persistent parasitemia, recurrent anemia, and hemolysis may require prolonged treatment strategies and close monitoring.
Relapsing babesiosis remains a challenging clinical problem requiring additional research into persistent infection and optimal long-term management.
Related Articles
These related articles explore prolonged Babesia infection, co-infections, congenital transmission, and persistent symptoms associated with tick-borne illness.
Prolonged Babesia Infection in a Patient With Asplenia
Post-Treatment Lyme Disease Syndrome
Congenital Transmission of Babesia
Babesia and Lyme Disease
Delayed Lyme Disease Diagnosis
References
- Prasad PJ, Wormser GP. Failure of an Approximately Six Week Course of Tafenoquine to Completely Eradicate Babesia microti Infection in an Immunocompromised Patient. Pathogens. 2022;11(9):1047.
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
Dr. Cameron, I was just wondering if you’ve ever had success with treating Babesia with Alinia (nitazoxanide)? Thank you so very much for your time.
I don’t have enough experience to guide you.
For Babesia infection, treatment protocol using Ciprofloxacin can clear the parasite. 250mg x 3 times/day for five days can be curative. Cipro is good for mycoplasma infection too.
I have not seen any published evidence that ciprofloxacin is effective for Babesia.
I was diagnosed with babeesia in July. Still feel awful. Was given 10 days of azithromyicin and Avitoquoine. Seeing a Lyme dr. But he keeps giving me supplements that don’t help.
I have patients who have done well if their Babesia was treated long or retreated.
There are plenty of studies. Read the text carefully and start using fluoroquinolones (Cipro) for Babesia treatment. Curative protocol and can clear the infection really fast, one week treatment and the infection is cured, no symptoms and huge improvement.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6166754/
Thanks for sharing. I had not seen the intro study. The investigators included fluoroquinolones that are not available. I hope the investigators proceed to work with humans or animals. I would be interested in how humans tolerate fluoroquinolones as some patients with with Lyme disease and Babesia report tendonitis and muscle pain.