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Rocky Mountain Spotted Fever

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Rocky Mountain Spotted Fever (RMSF) is a severe tick-borne illness caused by Rickettsia rickettsii, a Gram-negative, coccobacillary bacterium. This pathogen is an obligate intracellular parasite, requiring a host cell for replication. Transmission occurs through the bite of an infected tick. In the United States, the most important vectors are Dermacentor variabilis (American dog tick) and Dermacentor andersoni (Rocky Mountain wood tick), though other tick species may also serve as vectors.

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Skin Diseases and Disorders

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Related Experiment Video

Updated: Jun 17, 2026

A Model for Experimental Exposure of Humans to Larval Ixodes scapularis Ticks

A Model for Experimental Exposure of Humans to Larval Ixodes scapularis Ticks

Published on: December 1, 2023

Tick bites and skin rashes.

Dirk M Elston¹

¹Department of Dermatology, Geisinger Medical Center, 100 North Academy Ave, Danville, Pennsylvania, USA. Dmelston@geisinger.edu

Current Opinion in Infectious Diseases

|January 15, 2010

Summary

This summary is machine-generated.

Tick bites can transmit serious diseases like Rocky Mountain spotted fever. Early doxycycline treatment is crucial for suspected tick-borne illnesses, and identifying tick vectors aids diagnosis and prevention.

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Extraction of Saliva, Haemolymph, Salivary Glands, and Midgut from Individual Ticks (Acari: Ixodidae)

Extraction of Saliva, Haemolymph, Salivary Glands, and Midgut from Individual Ticks (Acari: Ixodidae)

Published on: October 31, 2025

Area of Science:

Medical Entomology
Infectious Diseases
Public Health

Background:

Ticks are significant global vectors for numerous pathogens.
Tick-borne diseases pose a considerable threat to human health worldwide.
Emerging tick-borne pathogens present ongoing challenges in diagnosis and treatment.

Purpose of the Study:

To review medically important tick species and the diseases they transmit.
To highlight emerging tick-borne pathogens and their clinical significance.
To emphasize the urgency of diagnosing and treating tick-borne illnesses.

Main Methods:

Literature review of tick-borne diseases and their vectors.
Analysis of current epidemiological data on tick-borne illnesses.
Synthesis of information on diagnostic and therapeutic strategies.

Main Results:

Rocky Mountain spotted fever is a leading cause of mortality from tick-borne illness in the US and is increasing in South America.
Emerging diseases include anaplasmosis, ehrlichiosis, and rickettsial fevers.
Doxycycline is effective for most tick-borne illnesses, with prompt initiation critical for Rocky Mountain spotted fever.

Conclusions:

Prompt treatment with doxycycline is vital for suspected tick-borne illnesses, especially Rocky Mountain spotted fever.
Accurate identification of tick vectors is essential for diagnosis and implementing preventive measures.
Understanding tick-borne diseases and their vectors is key to reducing public health burdens.