| absence of rickettsia rickettsii and occurrence of other spotted fever group rickettsiae in ticks from tennessee. | rocky mountain spotted fever (rmsf) is the most common tick-borne illness in tennessee. little is known about the occurrence of r. rickettsii, the causative agent, in ticks in tennessee. to better understand the prevalence and distribution of rickettsial agents in ticks, we tested 1,265 amblyomma, dermacentor, and ixodes adult and nymphal ticks. additionally, we tested 231 amblyomma americanum larvae. ticks were collected from 49 counties from humans, wild animals, domestic canines, and flannel ... | 2010 | 20810834 |
| human infections by multiple spotted fever group rickettsiae in tennessee. | rocky mountain spotted fever is the most common tick-borne disease in tennessee. however, rickettsia rickettsii has rarely been isolated from endemic ticks, suggesting rickettsioses may be caused by other species. a total of 56 human serum samples that were serologically positive for exposure to rickettsia were obtained from commercial laboratories in 2010 and 2011. in addition, 20 paired sera from patients with encephalitis and positive rickettsia serology were obtained from the tennessee unexp ... | 2016 | 27022147 |
| investigating the adult ixodid tick populations and their associated anaplasma, ehrlichia, and rickettsia bacteria at a rocky mountain spotted fever hotspot in western tennessee. | ehrlichiosis and rickettsiosis are two common bacterial tick-borne diseases in the southeastern united states. ehrlichiosis is caused by ehrlichiae transmitted by amblyomma americanum and rickettsiosis is caused by rickettsiae transmitted by amblyomma maculatum and dermacentor variabilis. these ticks are common and have overlapping distributions in the region. the objective of this study was to identify anaplasma, ehrlichia, and rickettsia species associated with questing ticks in a rocky mounta ... | 2017 | 28598270 |