| Borrelia persica | A species that causes relapsing fever in the Middle East and central Asia; the vector is the tick Ornithodoros tholozani. (05 Mar 2000) |
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| Borrelia recurrentis | A species causing relapsing fever in South America, Europe, Africa, and Asia; transmitted by the bedbug, Cimex lectularius, and the louse, Pediculus humanus subsp. Humanus. Synonym: Obermeier's spirillum, Spirochaeta obermeieri. (05 Mar 2000) |
| Borrelia theileri | A species that causes borreliosis in cattle and other mammals in South Africa and Australia; transmitted by the ticks Boophilus microplus and Rhipicephalus evertsi. (05 Mar 2000) |
| Borrelia turicatae | A species found as a cause of relapsing fever in Mexico, New Mexico, Texas, Oklahoma, and Kansas; transmitted by Ornithodoros turicata. (05 Mar 2000) |
| Borrelia venezuelensis | A species causing spirochetal relapsing fever in Central and South America; transmitted by Ornithodoros rudis and O. Venezuelensis. (05 Mar 2000) |
| borreliosis | Disease caused by bacteria of the genus Borrelia. (05 Mar 2000) |