A 6-Year Analysis of Tick Surveillance in San Mateo County

Entomology Report February 2007, San Mateo County Mosquito Abatement District

% Infection of I. pacificus in San Mateo County Parks
Location             # Ix. pacificus Tested  % Infection
Pulgas Ridge                    60                3.3
Los Trancos Woods              733                2.5
Huddart Park                   140                2.1
Big Canyon Park                507                1.8
Crystal Springs Trail          556                1.6
San Pedro Valley Park          333                0.9
Laurelwood Park                428                0.7
Edgewood Park                  195                0.5

An analysis of tick surveillance data from 2002 through February 2007 in San Mateo County was performed. Adult Ixodes pacificus ticks have been collected from 11 parks. Thus far Lyme disease spirochetes have been detected in ticks from 8 parks (Big Canyon Park, Crystal Springs Trail, Edgewood Park, Huddart Park, Laurelwood Park, Los Trancos Woods, Pulgas Ridge, and San Pedro Valley Park). The prevalence of infection in ticks at these parks ranged from 0.5% - 3.3%. Ticks collected from Costanoa, Sweeney Ridge, and Water Dog Lake have not yet tested positive for Lyme Disease spirochetes.

Previous related entries:

Tick Surveillance in San Mateo County, January 2007, January 2007
Tick Surveillance in San Mateo County, December 2006, December 2006
San Mateo County: Lyme Disease Surveillance Winter/Spring 2005-06, June 2006
San Mateo County: Lyme Disease Surveillance Winter/Spring 2005-06, April 2006
San Mateo County: Lyme Disease Surveillance Winter/Spring 2005-06, March 2006
San Mateo County: Lyme Disease Surveillance 2006, February 2006
San Mateo County: Lyme Disease Surveillance 2006, January 2006
San Mateo County: Lyme Disease Surveillance, November/December 2005
San Mateo County: Lyme Disease Surveillance, October 2005
San Mateo County: Lyme Disease Surveillance, January 2005