Figure. Iowa maps showing Ehrlichia chaffeensis seropositive specimens by county. The total number of positive specimens was 102 of 1,775 in 1994 (top map) and 91 of 1,102 in 1996 (bottom map). Within each of the 99 counties is listed the number of positive specimens over the total submitted for the county. Colors indicate the percentage of positive specimens as listed in the key.
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