County of Los Angeles
Department of Public Health
Acute Communicable Disease Control
313 N. Figueroa Street, Room 212
Los Angeles, CA 90012
Phone: (213) 240-7941
Fax: (213) 482-4856
E-Mail:acdc2@ph.lacounty.gov
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Acute Communicable Disease Control
Rocky Mountain Spotted Fever
Rocky Mountain spotted fever is the most severe and most frequently reported rickettsial illness
in the United States. It also occurs in Mexico and in Central and South America. The disease is
caused by Rickettsia rickettsii, a species of bacteria that is spread to humans by ixodid
(hard) ticks. Initial signs and symptoms of the disease include sudden onset of fever,
headache, and muscle pain, followed by development of rash. The disease can be difficult
to diagnose in the early stages, and without prompt and appropriate treatment it can be
fatal.
Rocky Mountain spotted fever is the most severe and most frequently reported rickettsial illness
in the United States. It also occurs in Mexico and in Central and South America. The disease is
caused by Rickettsia rickettsii, a species of bacteria that is spread to humans by ixodid
(hard) ticks. Initial signs and symptoms of the disease include sudden onset of fever,
headache, and muscle pain, followed by development of rash. The disease can be difficult
to diagnose in the early stages, and without prompt and appropriate treatment it can be
fatal.
