Abstract
In a relatively restricted area in southern Idaho there is a very heavy infestation of O. parkeri in ground squirrel and prairie dog burrows and an unusually high incidence of spirochetes. Of a total of 1,466 ticks collected, 1,298 were tested in 163 sublots, 69 of which were positive for spirochetes. This is the heaviest infestation of 0. parkeri thus far encountered in any one area in the 9 States (Wyoming, Colo., Utah, Mont., Wash., Ore., Nev., Calif., and Idaho) in which this sp. has been collected, with the possible exception of an isolated area in central California. The number of spirochete strains recovered far exceeds all others. Relapsing fever has not been reported from this area.

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