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Published Online: 8 March 2012

Detection of Rickettsia parkeri and Candidatus Rickettsia andeanae in Amblyomma maculatum Gulf Coast Ticks Collected from Humans in the United States

Publication: Vector-Borne and Zoonotic Diseases
Volume 12, Issue Number 3

Abstract

Rickettsia parkeri, a spotted fever group (SFG) rickettsia recently found to be pathogenic to humans, causes an eschar-associated febrile illness. The R. parkeri rickettsiosis, Tidewater spotted fever, has been misdiagnosed as Rocky Mountain spotted fever due to serologic cross reactivity and the lack of specific diagnostic methods. Candidatus Rickettsia andeanae, also a SFG rickettsia, is a recently described agent of unknown pathogenicity originally identified in ticks collected from domestic animals during a fever outbreak investigation in northern Peru. Among 37 Amblyomma maculatum (collected from humans (n=35) and questing (n=2)) obtained from the southern United States during 2000–2009, nine and four A. maculatum nucleic acid preparations were found positive for R. parkeri and Candidatus R. andeanae, respectively, by newly developed genus- and species-specific quantitative real-time polymerase chain reaction assays. In addition Rickettsia felis was found in two A. maculatum nucleic acid preparations.

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cover image Vector-Borne and Zoonotic Diseases
Vector-Borne and Zoonotic Diseases
Volume 12Issue Number 3March 2012
Pages: 175 - 182
PubMed: 22022815

History

Published online: 8 March 2012
Published in print: March 2012
Published ahead of print: 24 October 2011

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Ju Jiang
Naval Medical Research Center, Silver Spring, Maryland.
Ellen Y. Stromdahl
U.S. Army Public Health Command (formerly U.S. Army Center for Health Promotion and Preventive Medicine), Aberdeen Proving Ground, Maryland.
Allen L. Richards
Naval Medical Research Center, Silver Spring, Maryland.
Uniformed Services University of the Health Sciences, Bethesda, Maryland.

Notes

Address correspondence to:Allen L. RichardsViral & Rickettsial Diseases DepartmentNaval Medical Research Center503 Robert Grant AvenueSilver Spring, MD 20910-7500E-mail: [email protected]

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No competing financial interests exist.

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