Tick-borne relapsing fever: what to know

The illness may seem to improve before fever returns. This changing pattern can happen because the bacteria vary in ways that affect the immune response. Symptoms can include shivering, sweating, weakness, nausea, joint or muscle pain, and light sensitivity. A recent stay in a rustic building, outdoor travel, or a known tick bite is useful information for the clinician. Fever alone has many possible causes, including Common Cold or COVID-19, so the exposure history and examination matter.

Contact a doctor promptly if fever follows a tick exposure, especially when it returns after settling. Rest, drink fluids if you can, and note temperature readings, symptom-free periods, travel, and medicines taken. Do not start antibiotics without advice. Tell the clinician about pregnancy, immune problems, allergies, and recent travel. Diagnosis may involve an examination and blood tests chosen for the timing of symptoms.

Seek urgent medical care for confusion, severe headache, breathing difficulty, fainting, persistent vomiting, a stiff neck, unusual bleeding, or inability to drink. A person who becomes very weak or unusually drowsy needs prompt assessment. Pregnant people, young children, older adults, and anyone with reduced immunity should contact a clinician early after compatible symptoms and tick exposure.

Ask which features support tick-borne relapsing fever, whether testing should be timed around a fever episode, which treatment is appropriate, and what reaction or symptom should trigger emergency help. Also ask how to prevent another tick bite during travel or outdoor activity.