TABLE 1.
Anaplasma strain-specific infection rates and levels in Dermacentor andersoni
| Strain and feeding | Midgut
|
Salivary glands
|
||
|---|---|---|---|---|
| Infection ratea (no. positive/no. tested) | Infection levelb (mean ± SD) | Infection rate (no. positive/no. tested) | Infection level (mean ± SD) | |
| St. Maries | ||||
| Acquisitionc | 100 (25/25) | 106.4 ± 0.45 | 100 (25/25) | 105.3 ± 0.76 |
| Transmissiond | 100 (25/25) | 106.7 ± 0.61 | 100 (25/25) | 107.4 ± 0.68 |
| Israel vaccine | ||||
| Acquisitionc | 92 (23/25) | 105.3 ± 0.59 | 88 (22/25) | 104.5 ± 0.77 |
| Transmissiond | 92 (23/25) | 105.2 ± 0.87 | 88 (22/25) | 106.1 ± 0.89 |
a
Percentage of fed ticks that acquired infection.
b
Number of bacteria per midgut or salivary gland pair.
c
Ticks were acquisition fed on calves infected with each specific strain.
d
Ticks were transmission fed on naïve (competitive enzyme-linked immunosorbent assay-seronegative, msp5 PCR-negative) calves.