Table 1.
Variables associated with mixed blood meal analysis among 225 engorged adult female ticks.
| No. Ticks Human Blood Meal Positive (N = 76) | No. Ticks Human Blood Meal Negative (N = 149) | p-Value | OR | 95% CI | |
|---|---|---|---|---|---|
| Genus | |||||
| Prostriata | 33 (43.4%) | 75 (50.3%) | - | - | - |
| Metastriate | 43 (56.6%) | 74 (49.7%) | 0.327 | 1.32 | 0.76 to 2.31 |
| Species | |||||
| Amblyomma americanum | 11 (14.5%) | 29 (19.5%) | 0.356 | 0.70 | 0.33 to 1.49 |
| Dermacentor variabilis | 26 (34.2%) | 34 (22.8%) | 0.069 | 1.776 | 0.96 to 3.23 |
| Amblyomma maculatum | 0 (0.0%) | 5 (3.4%) | - | - | - |
| Ixodes scapularis | 25 (32.9%) | 64 (43.0%) | 0.146 | 0.65 | 0.37 to 1.16 |
| Ixodes kieransi | 8 (10.5%) | 11 (7.4%) | 0.425 | 1.48 | 0.57 to 3.84 |
| Haemaphyalis longicornis | 6 (7.9%) | 6 (4.0%) | 0.230 | 2.04 | 0.64 to 6.56 |
| Calendar Month | |||||
| January | 22 (28.9%) | 44 (29.5%) | 0.928 | 0.78 | 0.53 to 1.79 |
| February | 1 (1.3%) | 12 (8.1%) | 0.073 | 0.15 | 0.02 to 1.19 |
| March | 18 (23.7%) | 18 (12.1%) | 0.027 | 2.26 | 1.10 to 4.65 |
| May | 33 (43.4%) | 74 (49.7%) | 0.376 | 0.15 | 0.45 to 1.36 |
| July | 2 (2.6%) | 1 (0.7%) | 0.261 | 0.97 | 0.36 to 44.83 |
| Location | |||||
| Region | |||||
| Lowcountry | 25 (32.9%) | 68 (45.6%) | 0.068 | 0.58 | 0.33 to 1.04 |
| PeeDee | 18 (23.7%) | 22 (14.8%) | 0.101 | 1.79 | 0.89 to 3.59 |
| Midlands | 2 (2.6%) | 1 (0.7%) | 0.261 | 3.99 | 0.36 to 44.83 |
| Upstate | 31 (40.8%) | 58 (38.9%) | 0.787 | 1.08 | 0.62 to 1.90 |
| County * | |||||
| Aiken | 2 (2.6%) | 1 (0.7%) | 0.261 | 3.99 | 0.36 to 44.83 |
| Charleston | 25 (32.9%) | 68 (45.6%) | 0.068 | 0.58 | 0.33 to 1.04 |
| Clarendon | 0 (0.0%) | 4 (2.7%) | - | - | - |
| Greenville | 2 (2.6%) | 12 (8.1%) | 0.130 | 0.31 | 0.07 to 1.41 |
| Greenwood | 22 (28.9%) | 40 (26.8%) | 0.739 | 1.11 | 0.60 to 2.05 |
| Horry | 18 (23.7%) | 18 (12.1.%) | 0.027 | 2.26 | 1.10 to 4.65 |
| Pickens | 6 (7.9%) | 6 (4.0%) | 0.230 | 2.04 | 0.64 to 6.56 |
| York | 1 (1.3%) | 0 (0.0%) | - | - | - |
| Pathogen Testing | |||||
| Overall Total Positives | 37 (48.7%) | 68 (45.6%) | 0.665 | 1.13 | 0.65 to 1.97 |
| Panola Mountain Ehrlichia | 1 (1.3%) | 6 (4.0%) | 0.263 | 0.29 | 0.04 to 2.51 |
| Ehrlichia ewingii | 1 (1.3%) | 4 (2.7%) | 0.484 | 0.45 | 0.50 to 4.19 |
| Ehrlichia chaffeensis | 3 (3.9%) | 1 (0.7%) | 0.127 | 6.00 | 0.60 to 59.86 |
| Rickettsia species | 36 (24.2%) | 66 (44.3%) | 0.692 | 1.59 | 0.16 to 15.87 |
| Rickettsia parkeri | 17 (11.4%) | 31 (20.8%) | 0.920 | 1.04 | 0.47 to 2.32 |
| Rickettsia rickettsii | 0 (0.0%) | 0 (0.0%) | - | - | - |
| Rickettsia amblyommatis | 24 (31.6%) | 42 (28.2%) | 0.686 | 1.19 | 0.52 to 2.72 |
| Borrelia burgdorferi | 0 (0.0%) | 1 (0.7%) | - | - | - |
| Anaplasma phagocytophilum | 1 (1.3%) | 0 (0.0%) | - | - | - |
| Theileria orientalis | 0 (0.0%) | 0 (0.0%) | - | - | - |
* Category statistically significant overall by multinominal regression.