TABLE 3.

Distribution of titers of antibodies to the HGE agent and to E. chaffeensis based on paired testing of 2,128 serum samples^a

^aMultiple samples from individuals were included when available. The boxed area represents 37 dually reactive serum samples that were less than fourfold different in their titers of antibodies to both antigens. The titer of antibodies to the HGE agent was fourfold higher than the titer of antibodies to E. chaffeensis in 13 samples above the boxed area, whereas the titer of antibodies to E. chaffeensis was fourfold higher than the titer of antibodies to the HGE agent in 48 samples below the boxed area.