Rocky Mountain spotted fever

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Rocky Mountain spotted fever
Synonyms	N/A
Pronounce	N/A
Specialty	N/A
Symptoms	Fever, rash, headache, muscle pain, vomiting
Complications	Hearing loss, paralysis, gangrene
Onset	2 to 14 days after exposure
Duration	Typically 2 weeks
Types	N/A
Causes	Rickettsia rickettsii
Risks	Tick bite
Diagnosis	Serology, PCR
Differential diagnosis	Measles, meningococcal disease, typhus
Prevention	Tick avoidance, tick repellent
Treatment	Doxycycline
Medication	Antibiotics
Prognosis	Good with treatment, high mortality if untreated
Frequency	5,000 cases per year in the United States
Deaths	0.5% with treatment, 20-30% without treatment

Rocky Mountain Spotted Fever

Introduction

Rocky Mountain Spotted Fever (RMSF) is a bacterial disease caused by Rickettsia rickettsii, transmitted to humans through the bite of an infected tick. It is most commonly reported in the United States, particularly in the southeastern and south-central regions, including the Rocky Mountain area.

Transmission and Epidemiology

RMSF is primarily transmitted through the bite of infected ticks, such as the American dog tick (Dermacentor variabilis), Rocky Mountain wood tick (Dermacentor andersoni), and the brown dog tick (Rhipicephalus sanguineus). The disease has a peak incidence in the spring and early summer.

Clinical Features

Symptoms of RMSF typically begin 2-14 days after a tick bite and include:

• High fever.
• Severe headache.
• Rash (often starting on the wrists and ankles and then spreading).
• Abdominal pain.
• Vomiting and nausea.

Diagnosis

Diagnosis of RMSF is based on clinical signs and symptoms, history of tick exposure, and can be confirmed through specialized laboratory tests, including serology and PCR.

Treatment

Early treatment is crucial and typically involves the administration of the antibiotic Doxycycline. Delay in treatment can lead to severe complications and even death.

Prevention and Control

Preventive measures include:

• Avoiding tick-infested areas.
• Using insect repellents.
• Wearing protective clothing.
• Regularly checking for and properly removing ticks.

Complications

If left untreated, RMSF can lead to serious complications like:

• Damage to the blood vessels resulting in clotting and bleeding.
• Organ failure.
• Death, in severe cases.

Public Health and Awareness

RMSF is a reportable disease in many regions, and public health initiatives focus on awareness, tick control, and prompt treatment strategies.

See Also

• Infectious diseases
• Tick-borne diseases
• Epidemiology

External Links

• CDC - Rocky Mountain Spotted Fever
• World Health Organization