Orange County: Rocky Mountain Spotted Fever Confirmed in County Park

Rocky Mountain Spotted Fever confirmed in County park, Orange County Vector Control District

Rocky Mountain Spotted Fever confirmed in County park. A Pacific Coast Tick, Dermacentor occidentalis that was collected in Aliso and Wood Canyons Wilderness Park tested positive for Rocky Mountain Spotted Fever (RMSF). Orange County Vector Control District (OCVCD) collected the tick on January 29, 2007 as part of an ongoing surveillance program. Samples were submitted to the California Department of Health Services (DHS), although the actual testing was done by The Centers for Disease Control and Prevention (CDC). The District received confirmation on the positive tick from DHS on, March 30, 2007.

Los Angeles County West: Locations of Lyme Positive Ticks

Locations of Lyme Positive Ticks, Los Angeles County West Vector Control District

Map:
Sites where ticks positive for Lyme disease bacterium have been found in the district

Charmlee Park
Malibu Creek State Park
Tapia State Park
Topanga State Park
Will Rogers State Park
Palos Verdes Estates - Bluff Cove
Rolling Hills - Purple Canyon Trail

Lyme Disease in Santa Clara County: Tick Infection Rates

Source: Lyme Disease in Santa Clara County, Santa Clara County Vector Control District

Location of tick sampling    % positive to Borrelia burgdorferi
Freemont Older                     3.85
Foothills Open Space Dist.         2.86
Sierra Azul                        2.86
Sanborn Skyline                    2.78
Alum Rock Park                     2.75
Uvas County Park                   2.39
Duveneck Windmill OSD              2.27
Villa Montalvo                     2.22
Almaden Quicksilver                1.72
Los Trancos                        1.26

San Mateo County: Tick Flagging with Santa Clara County Vector Control District

Entomology Report April 2007, San Mateo County Mosquito Abatement District

In April, District staff focused on collection of nymphal ticks for Lyme disease testing. On April 18, District laboratory staff collaborated with Santa Clara County Vector Control to search for nymphal ticks in sites near the county border. Sampling was carried out on Old Spanish Trail in Los Trancos Woods and at Foothill Park in Los Altos. These ticks are in the process of being tested for Lyme disease. Ixodes pacificus nymphs are active during the spring and early summer and are easily overlooked due to their small size. Nymphs infected with the bacteria that causes Lyme disease have been found throughout San Mateo County.