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Tick Surveillance, Water Year 2022-2023

Person in brown and grey uniform kneeling next to a white cloth on the ground while looking at the cloth

Laboratory staff began winter surveillance for adult Ixodes pacificus (Western black-legged ticks) in November. Ticks are collected by dragging a one-meter square sheet of white flannel over the vegetation alongside trails; a technique called “flagging.” 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 surveyed in November and December include Hidden Canyon Park in Belmont, San Pedro Valley Park in Pacifica, Edgewood Park in Redwood City, Mori Point in Pacifica, Mills Canyon Park in Burlingame, and Memorial Park near Pescadero. This year, District staff are also surveying residents’ yards for ticks, focusing primarily on Pacifica and Hillsborough.

Tick Collections from parks, 2022-2023 Winter Season (through Dec, 2022)

Park/NeighborhoodNearest City/TownNumber of Ix. pacificus
Edgewood County ParkRedwood City84
Hidden Canyon ParkBelmont270
San Pedro Valley ParkPacifica196
Mori PointPacifica0
Memorial ParkPescadero39
Mills Canyon ParkBurlingame18


Page last reviewed January 6, 2023

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