Molecular Detection of Rickettsia Species Within Ticks (Acari: Ixodidae) Collected from Arkansas United States

Journal of Medical Entomology
R T Trout FryxellPhillip C Williamson

Abstract

Rocky Mountain spotted fever (RMSF), caused by the etiological agent Rickettsia rickettsii, is the most severe and frequently reported rickettsial illness in the United States, and is commonly diagnosed throughout the southeast. With the discoveries of Rickettsia parkeri and other spotted fever group rickettsiae (SFGR) in ticks, it remains inconclusive if the cases reported as RMSF are truly caused by R. rickettsii or other SFGR. Arkansas reports one of the highest incidence rates of RMSF in the country; consequently, to identify the rickettsiae in Arkansas, 1,731 ticks, 250 white-tailed deer, and 189 canines were screened by polymerase chain reaction (PCR) for the rickettsial genes gltA, rompB, and ompA. None of the white-tailed deer were positive, while two of the canines (1.1%) and 502 (29.0%) of the ticks were PCR positive. Five different tick species were PCR positive: 244 (37%) Amblyomma americanum L., 130 (38%) Ixodes scapularis Say, 65 (39%) Amblyomma maculatum (Koch), 30 (9%) Rhipicephalus sanguineus Latreille, 7 (4%) Dermacentor variabilis Say, and 26 (44%) unidentified Amblyomma ticks. None of the sequenced products were homologous to R. rickettsii. The most common Rickettsia via rompB amplification was Rickettsia mo...Continue Reading

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Citations

Jul 31, 2016·Journal of Medical Entomology·Joy A HechtSandor E Karpathy
Sep 18, 2016·International Journal of Systematic and Evolutionary Microbiology·Sandor E KarpathyChristopher D Paddock
Sep 22, 2019·Insects·Carrie E De JesusSamantha M Wisely
Nov 22, 2020·Tropical Medicine and Infectious Disease·Janet L H SperlingKatharine E Magor
Nov 15, 2020·Applied and Environmental Microbiology·Jonathan D OliverUlrike G Munderloh

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