Table 1.
SNAP and VetScan test results for canine samples from Anaplasma phagocytophilum– and Anaplasma platys–endemic regions of the United States.
| Samples | SNAP test | VetScan test |
|---|---|---|
| A. phagocytophilum | ||
| Positive (n = 118) | ||
| No. positive (% sensitivity) | 100 (84.7) | 46 (39.0) |
| 95% CI | 77.0–90.2 | 30.7–48.0 |
| Negative (n = 118) | ||
| No. negative (% specificity) | 113 (95.8) | 101 (85.6) |
| 95% CI | 90.1–98.4 | 78.0–90.9 |
| A. platys | ||
| Positive (n = 59) | ||
| No. positive (% sensitivity) | 49 (83.1) | 34 (57.6) |
| 95% CI | 71.3–90.6 | 44.9–69.4 |
| Negative (n = 120) | ||
| No. negative (% specificity) | 119 (99.2) | 99 (82.5) |
| 95% CI | 94.9–100 | 74.6–88.3 |
CI = confidence interval. A. phagocytophilum and A. platys samples were collected from endemic regions in the northeastern/upper midwestern and southern United States, respectively. Samples were assigned based on results of reference tests. The A. phagocytophilum reference test was the IFA; the A. platys reference test was the species-specific ELISA.