Tick Surveillance, Water Year 2022-2023
Tick Collections from parks, 2022-2023 Season (November 2022 through April 2023)
Laboratory staff continued spring surveillance for nymphal Ixodes pacificus (Western black-legged ticks) in April. Nymphal ticks are collected by flagging with a 1-meter square white sheet of flannel attached to a wooden dowel, in leaf litter areas or on rocks and fallen logs. 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).
Parks and neighborhoods surveyed in April include Edgewood Park in Redwood City, Portola Valley Ranch community of Portola Valley, Wunderlich Park in Woodside and Eaton Park in San Carlos. Additionally, the front and back yards of residences in Hillsborough, Woodside and Pacifica were flagged for nymphal ticks as a follow-up to a residential tick study conducted in the winter.
Tick Collections from parks and neighborhoods, 2022-2023 Season (November 2022 through April 2023)
|Park/Neighborhood||Nearest City/Town||Number of Ix. pacificus||Number of Ix. pacificus nymphs|
|Edgewood County Park||Redwood City||116||55|
|Hidden Canyon Park||Belmont||270|
|San Pedro Valley Park||Pacifica||196|
|Mills Canyon Park||Burlingame||18|
|Burleigh H. Murray Ranch||Half Moon Bay||394|
|Portola Redwoods||La Honda||383|
|Portola Valley Ranch||Portola Valley||409||126|
|Sweeney Ridge||San Bruno||29|
|Eaton Park||San Carlos||60|
Page last reviewed May 5, 2023