Tick Surveillance, Water Year 2023-2024

Tick Collections from parks, 2023-2024 Season (November 2023 through June 2024)

Two microcentrifuge tubes containing small black particles, held between fingers. — Two vials of *Ixodes pacificus* nymphs, collected from Edgewood Park.

Laboratory staff continued spring surveillance for nymphal Ixodes pacificus (Western black-legged ticks) in April. Nymphal ticks are collected by flagging with a 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 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 included Edgewood Park in Redwood City, Coal Mine Ridge Nature Preserve and Windy Hill Open Space Preserve in Portola Valley, Wunderlich Park, Thornewood Open Space Preserve and Huddart Park in Woodside and San Pedro Valley Park in Pacifica. Additionally, a school in an unincorporated area near San Mateo was flagged for Ixodes nymphs.

Tick Collections from parks and neighborhoods, 2023-2023 Season (through April 2024)

Park/Neighborhood	Nearest City/Town	Number of Ix. pacificus adults	Number of Ix. pacificus nymphs
Garrett Park	Redwood City	3
Sign Hill Park	South San Francisco	0
Twin Pines Park	Belmont	0
Hillside Park	Daly city	0
Hillsborough south	Hillsborough	114
Mussel Rock	Daly City	1
Windy Hill Open Space Preserve	Portola Valley	443	101
Burleigh H. Murray Ranch	Half Moon Bay	126
Phleger Estate	Woodside	84
San Pedro Valley Park	Pacifica	100	13
Hidden Canyon	Belmont	55
Wunderlich Park	Woodside		70
Edgewood Park	Redwood City		187
Huddart Park	Woodside		74
Thornewood Open Space Preserve	Woodside		144
Coal Mine Ridge	Portola Valley		34

Page last reviewed May 8, 2024

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