Rocky Mountain spotted fever is a serious rickettsial illness in North America. The infection is caused by R Rickettsii and is spread to humans by the Dermacentor tick.
It typically presents with a headache, muscle pain, and a rash. The diagnosis is difficult as the signs and symptoms are non-specific.
The clues to the diagnoses are the tick bite, rash, and fever. The skin rash is centripetal, meaning it begins at the extremities and spreads to the trunk.
The rash is petechial and may involve the palms or soles. Other findings include elevated liver enzymes, thrombocytopenia, and hyponatremia.
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Adult Lab Normals
Pediatric Lab Normals
No visible dental staining in children treated with doxycycline for suspected Rocky Mountain Spotted Fever., Todd SR,Dahlgren FS,Traeger MS,Beltrán-Aguilar ED,Marianos DW,Hamilton C,McQuiston JH,Regan JJ,, The Journal of pediatrics, 2015 May [PubMed]
Rocky mountain spotted fever characterization and comparison to similar illnesses in a highly endemic area-Arizona, 2002-2011., Traeger MS,Regan JJ,Humpherys D,Mahoney DL,Martinez M,Emerson GL,Tack DM,Geissler A,Yasmin S,Lawson R,Hamilton C,Williams V,Levy C,Komatsu K,McQuiston JH,Yost DA,, Clinical infectious diseases : an official publication of the Infectious Diseases Society of America, 2015 Jun 1 [PubMed]
Risk factors for fatal outcome from rocky mountain spotted Fever in a highly endemic area-Arizona, 2002-2011., Regan JJ,Traeger MS,Humpherys D,Mahoney DL,Martinez M,Emerson GL,Tack DM,Geissler A,Yasmin S,Lawson R,Williams V,Hamilton C,Levy C,Komatsu K,Yost DA,McQuiston JH,, Clinical infectious diseases : an official publication of the Infectious Diseases Society of America, 2015 Jun 1 [PubMed]
Feeding period required by Amblyomma aureolatum ticks for transmission of Rickettsia rickettsii to vertebrate hosts., Saraiva DG,Soares HS,Soares JF,Labruna MB,, Emerging infectious diseases, 2014 Sep [PubMed]