Tick Surveillance, Water Year 2024-2025
Tick Collections from parks, 2024-2025 Season (November 2024 through February 2025)
Laboratory staff continued winter surveillance for adult Ixodes pacificus (Western black-legged ticks) in February. Ticks are collected by “flagging,” or dragging a one-meter square sheet of white flannel over the vegetation alongside trails. Ixodes pacificus ticks will be tested for the presence of Borrelia burgdorferi (the causative agent of Lyme disease), as well as Borrelia miyamotoi (the agent of hard-tick relapsing fever) and Anaplasma phagocytophilum (the agent of granulocytic anaplasmosis).
Seasonal tick surveillance was conducted at Edgewood Park and Pulgas Ridge in Redwood City, Los Trancos Open Space near Portola Valley, and Wavecrest Open Space in Half Moon Bay.
Tick Collections from parks and neighborhoods, 2024-2025 Season (through January 2025)
| Park/Neighborhood | Nearest City/Town | Number of Ix. pacificus adults |
|---|---|---|
| Windy Hill Open Space Preserve | Portola Valley | 412 |
| Wunderlich Park | Woodside | 377 |
| Edgewood Park | Redwood City | 735 |
| Crystal Springs Regional Trail | San Mateo | 113 |
| Laurelwood Park | San Mateo | 242 |
| Pulgas Ridge Open Space Preserve | Redwood City | 255 |
| Wavecrest Open Space | Half Moon Bay | 53 |
Page last reviewed March 6, 2025