TABLE 2.
Reactivities of serum samples that were seropositive for both the HGE agent (GMT = 280; titer range, 64 to 65,536) and for other ehrlichial and rickettsial antigens
| Antigen | No. testeda | No. reactive | % reactive | GMTb (range) |
|---|---|---|---|---|
| Ehrlichia chaffeensis | 182 | 98 | 53.8 | 694 (64–131,072) |
| Coxiella burnetii | 111 | 9 | 8.1 | 203 (64–≥512) |
| Rickettsia rickettsii | 182 | 16 | 8.8 | 235 (64–≥2,048) |
| Rickettsia typhi | 110 | 8 | 7.3 | 70 (64–512) |
a
Not all serum samples positive for the HGE agent were tested against all other antigens; therefore, numbers tested vary.
b
IFA titers of ≥64 to the respective antigens.