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Living with Babesiosis

An infection of the red blood cells by parasites, usually spread by ticks.

Understanding Babesiosis

Babesiosis is an infection caused by tiny parasites that infect red blood cells and are mainly spread by ticks.

Many people who are infected have no symptoms. When symptoms occur, they can include flu-like signs such as fever, chills, headache, body aches, nausea, and tiredness. In severe cases it can be linked to hemolytic anemia, which is when red blood cells break down faster than the body can replace them.

Signs & symptoms

Symptoms vary from person to person, and many people have none. GARD lists these among the most common:

  • Fever
  • Tiredness (fatigue)
  • Headache
  • Muscle aches and joint pain
  • Excessive sweating
  • Hemolytic anemia

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Your doctor may refer you to a specialist who knows rare conditions.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

  4. Connect with expert centers

    Project Lyme may keep lists of experts for this condition.

Care & treatment

Care team
A doctor familiar with rare conditions, plus specialists as needed
Expert care
Expert lists: Project Lyme
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Project Lyme
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
How is babesiosis tested for?
What treatment is used for the infection?
How can I lower the chance of tick bites?

Quick facts

Symptoms usually startany time in life

It is caused by Babesia parasites, which are mainly spread by infected ticks. GARD does not list a gene or inheritance pattern.

Infectious

Also known as: babesia caused disease or disorder; babesia disease or disorder; babesia infectious disease; babesiasis; infection by babesia; piroplasmosis

Patient organizations

Source: NIH GARD · BabesiosisGARD ID 5878 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Babesiosis.

Explore the Babesiosis blog

Explore research for Babesiosis

Explore actively recruiting Babesiosis studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Babesiosis with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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I can help you find recruiting Babesiosis studies. Enter a ZIP code, address or city below and I'll look within 50 miles.

Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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HealthStoryfor Babesiosis

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HealthStory evolves private journaling with a living AI journal that talks back and asks thoughtful questions, helping you capture your Babesiosis experiences more deeply and prepare for better conversations with your doctors and care team.

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