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Tick Surveillance Update for Water Year 2018-2019
June 2019

Laboratory staff continued collecting Ixodes pacificus ticks in the nymph life stage and adult Dermacentor ticks during the month of June. Collections in June occurred at Año Nuevo and the nearby Costanoa campground. A very high number of Dermacentor ticks have been collected from this location because District staff have made multiple collecting trips as part of a study on Tularemia. Ixodes pacificus nymphs are active in the spring, and more difficult to collect in abundant numbers than adult ticks because they are typically on fallen logs or in leaf litter, whereas adult ticks are easily found on the edges of vegetation along trails. Surveillance for Ixodes pacificus nymphs will be concluded at the end of June. Ticks of the genus Ixodes will be tested for the Lyme disease causing bacteria Borrelia burgdorferi and other disease causing bacteria Borrelia miyamotoi and Anaplasma phagocytophilum. Ticks of the genus Dermacentor will be tested for tularemia.

Nymphal Ixodes Tick Collections 2018-2019 Spring Season, YTD

Park

Nearest City/Town

Number of Ix. pacificus nymphs

Thornewood Open Space Preserve

Woodside

71

Wunderlich Park

Woodside

80

Water Dog Lake

Belmont

36

Big Canyon

San Carlos

7

Eaton Park

San Carlos

58

Laurelwood Park

San Mateo

In process

Año Nuevo

Pescadero

1336

 

Dermacentor Tick Collections 2018-2019 Spring Season, YTD

Park

Nearest City/Town

Number of Dermacentor ticks

Edgewood Park

Redwood City

180

Año Nuevo

Pescadero

10

Commands