TY - CHAP M1 - Book, Section TI - Rocky Mountain Spotted Fever A1 - Hardin, J. Matthew A2 - Knoop, Kevin J. A2 - Stack, Lawrence B. A2 - Storrow, Alan B. A2 - Thurman, R. Jason PY - 2021 T2 - The Atlas of Emergency Medicine, 5e AB - Rickettsia rickettsii, the causative organism of RMSF, is transmitted by the bite of an infected tick. Fever, headache, rigors, abdominal pain, myalgias, and malaise occur 2 to 14 days after inoculation. Three to 5 days after the onset of symptoms, the rash begins with erythematous, blanching macules on the distal extremities (wrists and ankles). This is followed by centripetal spread to the trunk and the palms and soles. The lesions evolve into papules and petechia. Without treatment, RMSF has a 25% mortality; delayed diagnosis and treatment result in 3% to 4% mortality. SN - PB - McGraw-Hill CY - New York, NY Y2 - 2024/10/06 UR - accessemergencymedicine.mhmedical.com/content.aspx?aid=1181043845 ER -