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Rickettsia parkeri
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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.
Learn more about Tickborne Diseases (online CE course)
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 develops 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.
41. Paddock, Christopher. “Amblyomma Maculatum Tick.” Centers for Disease Control and Prevention, 2008,
https://phil.cdc.gov/Details.aspx?pid=10879
.
42. “Signs and Symptoms.” Centers for Disease Control and Prevention, 18 Jan. 2019,
https://www.cdc.gov/otherspottedfever/symptoms/index.html
.
Amblyomma maculatum
as a larval tick, nymph, adult male, and adult female stages (41).
Eschar at site of bite seen in Rickettsia parkeri infection (42).
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