Relapsing fever is an infectious disease that can be passed to humans by ticks. Relapsing fever is most common in the western United States. Symptoms usually start three to 11 days (average six days) after the tick bite. They may last for several days, go away and then return (relapse) several days later. Symptoms of relapsing fever include:
- High fever that begins suddenly.
- Headache, often severe.
- Rapid heart rate.
- Muscle aches (myalgia).
- Abdominal pain.
- General feeling of illness (malaise).
- Rash (up to 50 percent of cases).
Prescription medicine is used to treat relapsing fever.
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