TABLE 1.
Prevalence of confirmed and probable cases of HGE from throughout the United Statesa
| State | No. of individuals tested for HGE | No. of confirmed or probable cases of HGE (prevalence %) | No. of confirmed or probable cases of HME also reactive with the HGE agent | No. of confirmed or probable cases of human ehrlichiosis (agent undetermined) |
|---|---|---|---|---|
| California | 62 | 1 (1.6) | 3 | |
| Connecticut | 59 | 14 (23.7) | 2 | |
| Florida | 138 | 7 (5.1) | 8 | 2 |
| Georgia | 25 | 2 (8.0) | 1 | |
| Hawaii | 22 | 1 (4.5) | 1 | |
| Kentucky | 13 | 1 (7.7) | 1 | 1 |
| Maine | 3 | 1 (33.3) | 1 | |
| Maryland | 189 | 3 (1.6) | 5 | 3 |
| Massachusetts | 71 | 1 (1.4) | 1 | |
| Minnesota | 47 | 4 (8.5) | ||
| Missouri | 52 | 1 (1.9) | 3 | 2 |
| Montana | 21 | 1 (4.8) | 1 | |
| New Jersey | 5 | 1b (20.0) | ||
| New York | 151 | 18 (11.9) | 1 | 1 |
| Oklahoma | 15 | 1 (6.7) | 1 | |
| Pennsylvania | 9 | 1 (11.1) | 1 | 1 |
| Rhode Island | 6 | 2 (33.3) | ||
| Tennessee | 41 | 1 (2.4) | 2 | |
| Texas | 21 | 1 (4.8) | ||
| West Virginia | 3 | 1 (33.3) | 1 | |
| Wisconsin | 163 | 15 (9.2) | 1 | |
| Total | 1,116 | 78 (7.0) | 22c | 22d |
Based on analysis of serum samples submitted to the CDC for testing against a panel of rickettsial agents between 1987 and 1997. In addition, a probable case of HGE among serum samples from 198 healthy blood donors was detected in Washington. An additional 450 patients were negative for HGE (titers of <64) from the following states and the District of Columbia: Alabama (n = 87), Arkansas (n = 38), Arizona (n = 6), Colorado (n = 9), District of Columbia (n = 11), Delaware (n = 9), Iowa (n = 17), Illinois (n = 15), Indiana (n = 17), Kansas (n = 1), Louisiana (n = 5), Michigan (n = 16), Mississippi (n = 2), North Carolina (n = 57), Nebraska (n = 22), New Hampshire (n = 4), New Mexico (n = 7), Nevada (n = 2), Ohio (n = 13), Oregon (n = 47), South Carolina (n = 10), Utah (n = 3), Virginia (n = 37), Washington (n = 12), and Wyoming (n = 3). States of origin of 36 patients who were negative for HGE were not identified. Seven states were selected for retrospective testing: California, Connecticut, Florida, Maryland, Minnesota, New York, and Wisconsin.
This likely was a case of Rocky Mountain spotted fever (see the text).
In addition, 10 confirmed or probable cases of HME were detected in the following states: Alabama (n = 1), Arkansas (n = 1), Delaware (n = 1), Illinois (n = 1), Mississippi (n = 1), North Carolina (n = 3), and South Carolina (n = 2). Two confirmed or probable cases were also detected in the District of Columbia.
In addition, eight cases of human ehrlichiosis (agent undetermined) were detected in Alabama (n = 1), Arkansas (n = 1), Delaware (n = 1), North Carolina (n = 2), and the District of Columbia (n = 1); samples from two cases were submitted from commercial laboratories, and the states of origin for these samples are unknown.