High rates of rickettsia parkeri infection in gulf coast ticks (Amblyomma maculatum) and identification of "candidatus Rickettsia Andeanae" from Fairfax County, Virginia

Christen M. Fornadel, Xing Zhang, Joshua D. Smith, Christopher D. Paddock, Jorge R. Arias, Douglas Norris

Research output: Contribution to journalArticle


The Gulf Coast tick, Amblyomma maculatum, is a vector of Rickettsia parkeri, a recently identified human pathogen that causes a disease with clinical symptoms that resemble a mild form of Rocky Mountain spotted fever. Because the prevalence of R. parkeri infection in geographically distinct populations of A. maculatum is not fully understood, A. maculatum specimens collected as part of a tick and pathogen surveillance system in Fairfax County, Virginia, were screened to determine pathogen infection rates. Overall, R. parkeri was found in 41.4% of the A. maculatum that were screened. Additionally, the novel spotted fever group Rickettsia sp., tentatively named "Candidatus Rickettsia andeanae," was observed for the first time in Virginia.

Original languageEnglish (US)
Pages (from-to)1535-1539
Number of pages5
JournalVector-Borne and Zoonotic Diseases
Issue number12
Publication statusPublished - Dec 1 2011



  • Amblyomma maculatum
  • Rickettsia andeanae
  • Rickettsia parkeri
  • Virginia

ASJC Scopus subject areas

  • Infectious Diseases
  • Microbiology
  • Virology

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