Rocky Mountain Spotted Fever (RMSF)
![Close up image of an American Dog Tick.](/congress115th/20190113045820im_/https://www.cdc.gov/rmsf/images/Dermacentor1350x389.jpg)
Rocky Mountain spotted fever (RMSF) is a bacterial disease spread through the bite on an infected tick. Most people who get sick with RMSF will have a fever, headache, and rash. RMSF can be deadly if not treated early with the right antibiotic.
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Page last reviewed: October 26, 2018