Table 1.
Prevalence of Anaplasma phagocytophilum in western black-legged ticks (Ixodes pacificus) collected from recreational areas in the San Francisco Bay Area (2012–2013)
| Site | Adult I. pacificus | Nymphal I. pacificus | ||
|---|---|---|---|---|
| 2012 | 2013 | 2012 | 2013 | |
| Marin County | ||||
| China Camp SP | 1/143 (0.7)* | 0/2 | 1/43 (2.3) | 0/10 |
| Napa County | ||||
| Bothe-Napa Valley SP | – | 0/26 | – | 0/38 |
| San Mateo County | ||||
| Jasper Ridge Biological Preserve | 0/32 | 0/28 | 0/21 | 0/3 |
| Pulgas Ridge OSP | 0/110 | 0/11 | 3/13 (23.1) | 0/6 |
| Edgewood Park | 0/1 | – | 2/6 (33.3) | |
| Huddart Park | – | – | 1/10 (10.0) | |
| Corte de Madera | – | 0/3 | – | 0/6 |
| Thornewood OSP (woodland) | 0/156 | 0/26 | 2/25 (8.0) | 0/19 |
| Thornewood OSP (redwood) | 0/9 | 0/3 | 110/9 | 1/9 (11.1) |
| Windy Hill OSP (woodland) | 0/120 | 0/3 | 0/17 | 0/51 |
| Windy Hill OSP (chaparral/grassland) | 0/122 | 0/10 | – | – |
| Wunderlich County Park | 0/15 | 0/22 | 0/15 | 0/27 |
| Santa Clara County | ||||
| Foothills Park | 2/13 (15.4) | 2/51 (3.9) | 11/37 (29.7) | 0/27 |
| Hidden Villa | – | 0/9 | – | 0/28 |
| Henry Coe SP | 0/132 | – | – | |
| Monte Bello OSP | 1/77 (1.3) | 0/37 | 0/9 | 1/20 (5.0) |
| Sanborn County Park | 0/53 | – | – | – |
| Sierra Azul OSP | 1/112 (0.9) | 0/1 | – | 0/2 |
| Los Trancos OSP† | 2/58 (3.5) | 0/10 | 0/18 | 2/27 (7.4) |
| Santa Cruz County | ||||
| Castle Rock SP | 0/51 | – | – | 0/2 |
| Sonoma County | ||||
| Annadel SP | – | 1/4 (25.0) | – | 0/41 |
| Jack London SP | – | 1/15 (6.7) | – | 0/29 |
| Total | 7/1,204 (0.58) | 4/261 (1.5) | 20/223 (9.0) | 4/345 (1.2) |
SP = State Park; OSP = Open Space Preserve.
*
Number positive/number tested (percentage positive).
†
Los Trancos straddles the San Mateo and Santa Clara County border.