A Tick/Rickettsia Survey of Dogs in Three Counties in Mississippi, USA1

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Abstract
From March through September 1978 and March through June 1979, a total of 4473 ticks were removed from 560 dogs in Hinds, Lafayette, and Oktibbeha counties, Mississippi, USA. Rickettsia-like organisms were detected in 17 Rhipicephalus sanguineus, 7 Dermacentor variabilis, and 7 Amblyomma americanum. Seventy-four percent of the hemolymph-test-positive (HTP) ticks were removed from penned hunting dogs; the black-and-tan hound was the predominant breed parasitized. Ninety-four percent of the HTP ticks came from Lafayette Co., and the remaining 6% from Hinds Co. No HTP ticks were collected from Oktibbeha Co.

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