Prevalence of Rickettsia Species (Rickettsiales: Rickettsiaceae) in Dermacentor variabilis Ticks (Acari: Ixodidae) in North Carolina

Journal of Medical Entomology
Madhavi L KakumanuCharles S Apperson

Abstract

The American dog tick, Dermacentor variabilis (Say), is a vector of spotted fever group (SFG) rickettsiae, including Rickettsia rickettsii the causative organism of Rocky Mountain spotted fever (RMSF). In North Carolina, SFG rickettsioses (including RMSF) are a leading cause of tick-borne illness. Knowledge of the infection rate and geographic distribution of D. variabilis ticks infected with Rickettsia spp. provides information on the spatial distribution of public health risk. Accordingly, we extracted genomic DNA from adult D. variabilis collected from field habitats in 32 North Carolina counties from 2009 to 2013. A nested PCR assay of the 23S-5S intergenic spacer (IGS) region of Rickettsia coupled with reverse line blot hybridization (RLBH) with species-specific probes was used to detect and identify rickettsiae to species. Approximately half of the 532 tick DNA samples exhibited a band of the expected size on agarose gels, indicating infection with Rickettsia spp. RLBH analyses showed R. amblyommatis (formerly 'Candidatus R. amblyommii'), R. parkeri, and R. montanensis were predominant, while other Rickettsia species detected included R. conorii-like, R. massiliae, R. rhipicephali, R. canadensis, R. bellii, and some unkno...Continue Reading

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Citations

Dec 12, 2018·Journal der Deutschen Dermatologischen Gesellschaft = Journal of the German Society of Dermatology : JDDG·Marcellus Fischer
Dec 12, 2018·Journal der Deutschen Dermatologischen Gesellschaft = Journal of the German Society of Dermatology : JDDG·Marcellus Fischer
May 23, 2020·Journal of Medical Entomology·Rebecca J Eisen, Christopher D Paddock
Dec 4, 2020·Microorganisms·Mariusz Piotrowski, Anna Rymaszewska
Nov 4, 2020·International Journal of Environmental Research and Public Health·Emma L GillinghamKayleigh Hansford

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