Relapsing Fever

Relapsing Fever is an acute bacterial infection caused by Borrelia spirochetes, characterized by recurring episodes of high fever separated by periods of remission. It primarily affects individuals in areas with poor hygiene, developing regions, or those exposed to infected ticks or lice.

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What is Relapsing Fever?

Relapsing Fever has been recognized for centuries, historically linked to epidemics during wars and famines. The causative *Borrelia* spirochetes were first observed in patient blood by *Otto Obermeier* in 1868, distinguishing it from other febrile illnesses like typhus.

Symptoms

  • Sudden onset of high fever (often >104°F / 40°C)
  • Chills and severe headache
  • Muscle and joint aches (myalgia and arthralgia)
  • Nausea, vomiting, and abdominal pain
  • Cycles of fever followed by periods of remission (days to weeks), then relapses (usually milder but recurring)

Transmission

Relapsing Fever is primarily transmitted through vectors. *Louse-borne relapsing fever (LBRF)* spreads when infected body lice are crushed on the skin, and the bacteria enter through broken skin. *Tick-borne relapsing fever (TBRF)* is transmitted through the bite of infected soft-bodied *Ornithodoros* ticks, which typically feed at night.

Contagious Period: Varies by disease

Prevention

  • Avoid contact with ticks and lice; use insect repellents (e.g., DEET or permethrin-treated clothing) in endemic areas.
  • Inspect skin and clothing for ticks after outdoor activities and remove them promptly and correctly.
  • Maintain good personal hygiene and sanitation, especially in crowded conditions or where lice infestation is a risk.
  • Control rodent populations around homes, as they can be hosts for infected ticks.

Active Outbreaks & Recent Cases

Real-time intelligence from global health monitoring and AI-powered surveillance

Data sources: BEACON, ProMED, WHO, CDC, and 50+ national health agencies

No Active Outbreaks Detected

Our AI-powered surveillance hasn't detected significant Relapsing Fever activity in the past 30 days.

Real-time monitoring continues 24/7 across BEACON, ProMED, WHO, CDC, and 50+ global health agencies

What This Means

Currently, Relapsing Fever case counts are within baseline expectations globally. However, diseases can emerge rapidly, which is why continuous monitoring is critical.

Stay Prepared

Download the Virus Watcher app to get instant alerts if Relapsing Fever activity increases in your region or travel destinations.

Prevention Remains Important

Even without active outbreaks, understanding Relapsing Fever prevention helps protect you and your community:

  • Avoid contact with ticks and lice; use insect repellents (e.g., DEET or permethrin-treated clothing) in endemic areas.
  • Inspect skin and clothing for ticks after outdoor activities and remove them promptly and correctly.
  • Maintain good personal hygiene and sanitation, especially in crowded conditions or where lice infestation is a risk.
  • Control rodent populations around homes, as they can be hosts for infected ticks.
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Expert Resources & References

Trusted information from leading health organizations

CDC

Official guidance from the U.S. Centers for Disease Control and Prevention

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WHO

Global disease surveillance and guidelines from the World Health Organization

View WHO Resources →

Research

Latest peer-reviewed research and clinical studies

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Medically Reviewed Content

Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.

Last reviewed: 2026-06-03

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