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Tick Surveillance Update for February 2019
Water Year 2018-2019

During February, laboratory staff continued surveillance for adult Ixodes pacificus (Western black-legged ticks). The continuous on-and-off rainfall greatly limited the number of tick flagging opportunities in February, which is typically a peak month for collecting adult Ixodes pacificus. The weather reduces the questing activity of the ticks and moisture saturates the tick flag, making it less effective as a collecting tool. Parks that were surveyed in February were Ano Nuevo State Park, south of Pescadero and Sweeney Ridge in San Bruno. Adult tick surveillance will continue through March, and nymphal tick surveillance is planned for spring. Ixodes pacificus ticks will be tested for the presence of bacteria Borrelia burgdorferi, Borrelia miyamotoi and Anaplasma phagocytophilum.

Tick Collection Results for 2018-2019 Winter Season

Park

Nearest City/Town

Number of Ix. pacificus

Half Moon Bay Coastal Trail

Half Moon Bay

1

Montara Mountain

Montara

216

Memorial Park

Loma Mar

44

Frontierland Park

Pacifica

6

Purisima Creek Redwoods OSP

Half Moon Bay/Woodside

240

Junipero Serra County Park

San Bruno

46

San Pedro Valley

Pacifica

449

Wavecrest OSP

Half Moon Bay

9

Coal Creek OSP

Portola Valley

358

Sweeney Ridge National Recreation Area

San Bruno

12

Ano Nuevo State Park

Pescadero

pending

Commands