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Borrelia (bә-rel´e-ә)   a genus of gram-negative, aerobic, spirochete bacteria that are parasites on mucous membranes and cause borreliosis and other conditions. B. burgdor´feri, transmitted by ticks of the genus Ixodes, is the cause of acrodermatitis chronica atrophicans, erythema chronicum migrans, and Lyme disease. B. recurren´tis is transmitted by the human body louse Pediculus humanus and causes louse-borne relapsing fever. A number of other species are spread by tick bites and cause tick-borne relapsing fever.




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