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Rocky Mountain Spotted Fever

Rocky Mountain Spotted Fever

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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Related Experiment Video

Updated: Jun 8, 2026

Feeding of Ticks on Animals for Transmission and Xenodiagnosis in Lyme Disease Research

Feeding of Ticks on Animals for Transmission and Xenodiagnosis in Lyme Disease Research

Published on: August 31, 2013

Dermoscopy of tick bite.

Efstathios Rallis¹

¹Department of Dermatology, Veterans Administration Hospital (NIMTS), Athens, Greece. efrall@otenet.gr

Thescientificworldjournal

|September 16, 2010

Summary

This summary is machine-generated.

A woman presented with itchy red bumps caused by numerous small ticks. Dermoscopy aided in identifying and removing 28 ticks, confirming the diagnosis of a tick infestation.

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Area of Science:

Dermatology
Parasitology

Background:

Cutaneous conditions can manifest with pruritic papules.
Tick bites can cause various dermatological reactions.

Observation:

A 54-year-old woman developed numerous, intensely pruritic, erythematous papules on her trunk within 12 hours.
Dermoscopy revealed small ticks within the majority of the lesions.

Findings:

Twenty-eight ticks were successfully removed from the patient's skin using angled forceps.
Dermoscopy proved to be an effective tool for diagnosing tick-induced lesions.

Implications:

Dermoscopy offers a simple, cost-effective method for identifying ectoparasites in dermatological practice.
Prompt diagnosis and removal of ticks are crucial for managing pruritic papular eruptions.