Spotted Fever Rickettsiosis

Spotted Fever Rickettsiosis is a group of bacterial infections caused by Rickettsia species, transmitted to humans by ticks. The most severe and well-known form is Rocky Mountain Spotted Fever (RMSF), primarily affecting people in the Americas. It is characterized by fever, headache, and often a distinctive rash.

0
Countries Affected
No data
Recent Cases (30d)
0
Active Outbreaks
N/A
Last Updated
📱 iOS App Temporarily Unavailable

We're working with Apple to restore our app to the App Store.

Get notified when it's back:
Email [email protected] (subject: REMINDER) or check back in a few days.

Track in App
Temporarily Unavailable
Track in App View Active Outbreaks

What is Spotted Fever Rickettsiosis?

Spotted Fever Rickettsiosis, particularly Rocky Mountain Spotted Fever (RMSF), was first recognized in the late 19th and early 20th centuries in the Rocky Mountain region of the United States. In 1906, Howard Ricketts identified the causative agent, a bacterium later named Rickettsia rickettsii in his honor, and confirmed its transmission by ticks. This discovery was pivotal in understanding tick-borne diseases.

Symptoms

  • High fever (often sudden onset)
  • Severe headache
  • Malaise and muscle aches
  • Rash (typically appears 2-5 days after fever, often starting on wrists and ankles, spreading to trunk, palms, and soles; can be maculopapular and later petechial)
  • Nausea, vomiting, and abdominal pain
  • Conjunctival injection (red eyes)

Transmission

Spotted Fever Rickettsiosis is primarily transmitted to humans through the bite of an infected tick. Common tick vectors include the American dog tick (Dermacentor variabilis), Rocky Mountain wood tick (Dermacentor andersoni), and brown dog tick (Rhipicephalus sanguineus). The bacteria are injected into the bloodstream through tick saliva during feeding. Person-to-person transmission does not occur.

Contagious Period: Varies by disease

Prevention

  • Avoid tick-infested areas, especially during warmer months
  • Wear protective clothing (long sleeves and pants) when outdoors
  • Use EPA-registered insect repellents (e.g., DEET, picaridin) on skin and permethrin on clothing/gear
  • Perform thorough tick checks on yourself, children, and pets after outdoor activities
  • Remove attached ticks promptly and correctly using fine-tipped tweezers
  • No human vaccine is currently available for Spotted Fever Rickettsiosis

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 Spotted Fever Rickettsiosis 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, Spotted Fever Rickettsiosis 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 Spotted Fever Rickettsiosis activity increases in your region or travel destinations.

Prevention Remains Important

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

  • Avoid tick-infested areas, especially during warmer months
  • Wear protective clothing (long sleeves and pants) when outdoors
  • Use EPA-registered insect repellents (e.g., DEET, picaridin) on skin and permethrin on clothing/gear
  • Perform thorough tick checks on yourself, children, and pets after outdoor activities
  • Remove attached ticks promptly and correctly using fine-tipped tweezers
  • No human vaccine is currently available for Spotted Fever Rickettsiosis
View Live Alerts

Track Spotted Fever Rickettsiosis and 200+ other diseases with personalized alerts

Expert Resources & References

Trusted information from leading health organizations

CDC

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

View CDC Resources →

WHO

Global disease surveillance and guidelines from the World Health Organization

View WHO Resources →

Research

Latest peer-reviewed research and clinical studies

View Research →

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

Stay Ahead of Spotted Fever Rickettsiosis Outbreaks

Get real-time alerts and intelligence on Spotted Fever Rickettsiosis and 200+ other diseases. Used by healthcare systems, EMS, schools, and travelers worldwide.

📱 iOS App Temporarily Unavailable

We're working with Apple to restore our app to the App Store.

Get notified when it's back:
Email [email protected] (subject: REMINDER) or check back in a few days.

Download App
Temporarily Unavailable
Download App Enterprise Solutions