Babesia Asplenia: Why 8 Weeks of Treatment Wasn’t Enough

Babesia asplenia is one of the most dangerous combinations in tick-borne disease. In their study “Trust the Process: Prolonged Babesia Parasitemia in an Elderly Man with Asplenia from the American Midwest,” Ivancich and colleagues describe an 89-year-old man with multiple comorbidities and splenectomy, who required 8 weeks of treatment for his Babesia infection to clear.

The man was evaluated after a fall at home. Prior to the fall, he reportedly had a fever for 2 to 3 days, a loss of appetite, and generalized weakness for one week.

“The patient had thrombocytopenia, leukocytosis with neutrophilia, transaminitis, hyperbilirubinemia, and elevated creatine kinase level consistent with tick-borne illness,” wrote the authors.

The patient lived in rural Wisconsin and had 2 cats, one of whom lived outdoors.

Why Babesia Asplenia Cases Are High Risk

The spleen plays a critical role in filtering infected red blood cells. Without it, patients cannot clear Babesia parasites effectively—leading to prolonged infection and higher parasitemia.

“We present a case of Babesia parasitemia lasting more than 6 weeks and requiring almost 8 weeks of parasite specific therapy in a patient with asplenia.”

The man was initially treated empirically with doxycycline and intravenous ceftriaxone for a tick-borne infection.

Tests Reveal Lyme Disease and Babesia

The patient tested positive for Lyme disease, as well as Babesia, based on a blood smear and positive PCR test and antibody test.

His treatment was switched to azithromycin (1,500 mg) and intravenous atovaquone (500 mg) daily.

The Babesia parasitemia increased to 7.37% during treatment. The Babesia parasite was still present in the red blood cells at 6 weeks.

“After an extended 8-week treatment with azithromycin and atovaquone, the patient demonstrated clinical resolution of babesiosis with a negative blood smear,” the authors wrote.

Extended Treatment Duration for Babesia Asplenia

The typical treatment duration is 7-10 days, the authors explained. “Some commonly used alternatives [to azithromycin and atovaquone] include atovaquone-proguanil, clindamycin, quinine, and artemisinin.”

But for babesia asplenia patients, standard treatment is rarely enough.

“Cases of prolonged parasitemia, such as in the case presented, have been known to relapse, sometimes even 2 years later.”

“Therefore, we suggest that providers consider follow-up examination after the apparent clearance of babesiosis,” the authors wrote.

Editor’s note: The 89-year-old man’s case was caught early. The authors did not address treatment for individuals who are not diagnosed until after the parasite clears from the red blood cells.

Clinical Takeaway

Asplenic patients require dramatically extended Babesia treatment duration compared to immunocompetent patients, as the spleen’s critical role in filtering parasitized red blood cells cannot be replaced by antimicrobial therapy alone. Key treatment considerations:

• Standard 7-10 day treatment courses fail in asplenic patients—this 89-year-old man with splenectomy required 8 weeks of azithromycin and atovaquone, with parasitemia persisting beyond 6 weeks despite appropriate therapy
• Parasitemia can increase during treatment even with appropriate medications—this patient’s Babesia parasitemia rose to 7.37% during therapy, demonstrating that splenic function loss creates unique therapeutic challenges not overcome by standard dosing
• Relapse risk extends years beyond apparent clearance—cases of prolonged parasitemia have relapsed up to 2 years after negative blood smears, requiring long-term follow-up monitoring even after clinical resolution
• Early diagnosis in asplenic patients does not guarantee uncomplicated treatment course—despite prompt recognition and appropriate therapy initiation, prolonged parasitemia and extended treatment were necessary, raising questions about optimal management for late-diagnosed cases where parasites have already cleared from peripheral blood

Frequently Asked Questions

Why is Babesia more dangerous for patients without a spleen?

The spleen filters infected red blood cells. Without it, babesia asplenia patients cannot clear parasites efficiently, leading to higher parasitemia and prolonged infection.

How long does treatment take for patients with asplenia?

Much longer than standard 7-10 day courses. This patient required 8 weeks. Some patients need chronic suppressive therapy.

Can Babesia relapse after treatment?

Yes. Relapse can occur even 2 years later, especially in asplenic or immunocompromised patients. Follow-up monitoring is essential.

What treatment is used for Babesia in asplenic patients?

Azithromycin and atovaquone are first-line. Some patients require clindamycin, quinine, or tafenoquine. Extended duration is key.

Should asplenic patients take extra precautions against ticks?

Absolutely. Asplenic patients are at high risk for severe disease. Aggressive tick prevention and early treatment are critical.

For comprehensive Babesia information organized by topic—including symptoms, testing, treatment, blood transfusion risks, and special populations—visit our complete Babesia guide.

Related Reading

• Babesia and Lyme: What Patients Need to Know
• Babesia Treatment Duration: When 10 Days Isn’t Enough
• Babesia Relapse: When Standard Treatment Fails

References

1. Ivancich M, Lutwick L, Shweta FNU. Trust the Process: Prolonged Babesia Parasitemia in an Elderly Man with Asplenia from the American Midwest. Am J Case Rep. Jul 18 2022;23:e936326.