Table 1.
Distribution of canine samples by state and Ehrlichia spp. seroprevalence relative to reported cases of HME.
| State | Total Number Samples | Total Ehrlichia (%) |
E. canis (%) |
E. ewingii (%) | E. chaffeensis (%) | HME cases/M* |
|---|---|---|---|---|---|---|
| Alaska | 2 | 0 | 0 | 0 | 0 | N |
| Alabama | 337 | 15 (4.5) | 1 (0.3) | 12 (3.6) | 5 (1.5) | 1.8 |
| Arkansas | 84 | 37 (44.0) | 3 (3.6) | 31 (36.9) | 18 (21.4) | 21.7 |
| Arizona | 1 | 0 | 0 | 0 | 0 | 0 |
| California | 5 | 0 | 0 | 0 | 0 | 0.04 |
| Colorado | 5 | 0 | 0 | 0 | 0 | N |
| Connecticut | 97 | 0 | 0 | 0 | 0 | 0.3 |
| Delaware | 27 | 0 | 0 | 0 | 0 | 23.3 |
| Florida | 733 | 27 (3.7) | 4 (0.5) | 19 (2.6) | 9 (1.2) | 0.6 |
| Georgia | 662 | 51 (7.7) | 1 (0.2) | 36 (5.4) | 23 (3.5) | 1.9 |
| Hawaii | 2 | 0 | 0 | 0 | 0 | N |
| Iowa | 14 | 0 | 0 | 0 | 0 | N |
| Illinois | 489 | 17 (3.5) | 0 | 8 (1.6) | 9 (1.8) | 2.4 |
| Indiana | 553 | 4 (0.7) | 0 | 4 (0.7) | 3 (0.5) | 0.3 |
| Kansas | 457 | 35 (7.7) | 4 (0.9) | 31 (6.8) | 5 (1.1) | 1.1 |
| Kentucky | 16 | 3 (18.8) | 1 (6.3) | 3 (18.8) | 0 | 2.9 |
| Louisiana | 274 | 6 (2.2) | 4 (1.5) | 2 (0.7) | 0 | 0 |
| Massachusetts | 241 | 2 (0.8) | 0 | 2 (0.8) | 2 (0.8) | 2.3 |
| Maryland | 254 | 16 (6.3) | 2 (0.8) | 9 (3.5) | 9 (3.5) | 8.3 |
| Maine | 13 | 0 | 0 | 0 | 0 | 0.8 |
| Michigan | 9 | 0 | 0 | 0 | 0 | 0.5 |
| Minnesota | 7 | 0 | 0 | 0 | 0 | 2.1 |
| Missouri | 663 | 190 (29) | 5 (0.8) | 151 (22.8) | 85 (12.8) | 28.4 |
| Mississippi | 151 | 9 (6.0) | 0 | 9 (6.0) | 2 (1.3) | 1.0 |
| Montana | 1 | 0 | 0 | 0 | 0 | N |
| North Carolina | 403 | 41 (10.2) | 3 (0.7) | 21 (5.2) | 23 (5.7) | 4.7 |
| Nebraska | 62 | 1 | 1 (1.6) | 0 | 0 | 1.4 |
| New Hampshire | 28 | 0 | 0 | 0 | 0 | 4.2 |
| New Jersey | 257 | 10 (3.9) | 1 (0.4) | 7 (2.7) | 5 (1.9) | 9.0 |
| New York | 188 | 3 (1.6) | 0 | 3 (1.6) | 1 (0.5) | 3.7 |
| Ohio | 428 | 5 (1.2) | 4 (0.9) | 1 (0.2) | 0 | 1.0 |
| Oklahoma | 514 | 47 (9.1) | 9 (1.8) | 37 (7.2) | 5 (1.0) | 33.2 |
| Pennsylvania | 96 | 1 (1.0) | 0 | 1 (1.0) | 0 | 0.7 |
| Rhode Island | 24 | 0 | 0 | 0 | 0 | 9.0 |
| South Carolina | 34 | 7 (20.6) | 3 (8.8) | 2 (5.9) | 3 (8.8) | 0.3 |
| South Dakota | 2 | 0 | 0 | 0 | 0 | 0 |
| Tennessee | 181 | 18 (9.9) | 5 (2.8) | 14 (7.7) | 5 (2.8) | 10.9 |
| Texas | 893 | 23 (2.6) | 18 (2.0) | 5 (0.6) | 1 (0.1) | 0.7 |
| Virginia | 385 | 48 (12.5) | 2 (0.5) | 31 (8.1) | 25 (6.5) | 8.4 |
| Wisconsin | 9 | 0 | 0 | 0 | 0 | 4.0 |
| West Virginia | 30 | 1 | 0 | 0 | 1 (3.3) | 0.3 |
| Unknown | 31 | 1 | 0 | 0 | 1 | |
| Total | 8662 | 618 (7.1) | 71 (0.8) | 439 (5.1) | 240 (2.8) |
*Average incidence of HME cases per million as reported for 2008 and 2009 by passive surveillance; MMWR June 25, 2010 (2008) and May 13, 2011 (2009) (N - not reported)