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The page below is a sample from the LabCE course Tickborne Diseases. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Amblyomma maculatum tick/CDC

Eschars of Rickettsia parkeri/CDC

Rickettsia parkeri

Rickettsia parkeri causes a mild form of Rocky Mountain spotted fever (RMSF). It was first confirmed in 2004 and is transmitted by the Amblyomma maculatum tick. This tick normally infects cattle on the Gulf Coast of Texas. R. parkeri has been reported in the East and Southern coastal regions of the United States. An eschar or vesicular rash developes 2-10 days after the tick bite. Symptoms include myalgia, mild headache, and arthralgia. Mild elevation of liver enzymes, mild thrombocytopenia and mild leukopenia are reported. Antibodies may cross react with those of RMSF.