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.
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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.
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
Local health department information and state-specific prevention guidance
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Whether you live in Oklahoma or are traveling there, knowing the symptoms, timeline, and when to seek care helps you act quickly if exposure occurs.
Seek care if you experience severe dehydration, bloody stools, high fever, or symptoms lasting more than 3 days. Children under 5, adults over 65, and immunocompromised individuals should seek care earlier.
Emergency symptoms: Severe dehydration, inability to keep fluids down for 12 or more hours, or neurological symptoms require emergency care.
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Trusted information from leading health organizations
Global disease surveillance and guidelines from the World Health Organization
View WHO Resources →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: 2026-07-18
No confirmed cases reported in Oklahoma yet. Here are the latest Spotted Fever Rickettsiosis reports from our global surveillance network.
This event envelope conta *Source: BEACON* - [View Full Report](https://beaconbio.org/en/event/?eventid=07c475c5-2a45-4f63-b348-18a8118cb183)
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