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Sera from 223 randomly selected dogs and 489 white-tailed deer (Odocoileus virginianus) were tested for antibodies to Borrelia burgdorferi using an indirect kinetic ELISA. Dog samples were obtained in 1989 whereas deer samples were obtained between 1975 and 1990. Ten known negatives and two known positives from each group were run on each plate as controls. Samples showing mean mOD values above the mean of negatives + 3 SD were considered positive. Twenty-six dog (11.7%) and 22 deer (4.5%) samples were positive. Deer reactors were first detected among 1978 samples. Reactive deer were from central and eastern Oklahoma whereas reactive dogs were mostly from central Oklahoma. Confirmed human cases between 1986 and 1989 were distributed throughout the state, thus showing no correlation with either deer or dog results.