Table 2 Rickettsia amblyommatis and R. parkeri positivity correlation by tick species, life stage, and location
N poolsa (%) | R. amblyommatis-positive pools N (%) | R. parkeri-positive pools N (%) | Spearman’s rank correlation (ρ) | P-value | |
|---|---|---|---|---|---|
Amblyomma americanum | 879 | 543 (61.8) | 240 (44.2) | −0.301 | < 0.0001 |
Amblyomma maculatum | 194 | 11 (5.7) | 120 (61.8) | −0.037 | 0.61 |
Dermacentor variabilis | 784 | 227 (28.9) | 149 (19.0) | −0.015 | 0.67 |
Haemaphysalis longicornis | 10 | 1 (10.0) | 2 (20.0) | − | − |
Rhipicephalus sanguineus | 44 | 21 (47.7) | 6 (13.6) | −0.380 | 0.01 |
Larvae | 20 | 8 (40.0) | 10 (50.0) | −0.408 | 0.07 |
Nymph | 254 | 122 (48.0) | 109 (42.9) | −0.388 | < 0.0001 |
Female | 870 | 390 (44.8) | 205 (23.6) | −0.097 | 0.004 |
Male | 767 | 283 (36.9) | 193 (25.2) | −0.232 | < 0.0001 |
Adults | 1637 | 673 (41.1) | 398 (24.3) | −0.189 | < 0.0001 |
Parks (questing ticks) | 423 (22.1) | 214 (50.6) | 183 (43.3) | −0.422 | < 0.0001 |
Shelters (host-attached ticks) | 1490 (77.9) | 589 (39.5) | 334 (22.4) | −0.142 | < 0.0001 |