San Mateo County: Lyme Disease Surveillance Winter/Spring 2005-06

Entomology Report April 2006, San Mateo County Mosquito Abatement District

The season for adult western black-legged ticks (vector of Lyme disease) is coming to a close. A total of 1,065 ticks were collected in 2005-06. This is twice the number collected in previous years. Participation by staff from the San Mateo County Health Department, the San Francisco Water Department and the California State Parks Department greatly increased the number of sites surveyed. Most collections were made in January and February. Frequent rains limited the number of days in March that surveys could be conducted. Ixodes pacificus ticks do not quest actively during heavy rains.

Park                              # Infected
Big Canyon, San Carlos            5/219  (2%)
Crystal Springs Trail, Millbrae   3/108  (3%)
Edgewood Pk, Redwood City         0/ 41  (0%)
Huddart Pk, Woodside              2/ 21 (10%)
San Pedro Valley Pk, Pacifica     3/252  (1%)

Previous related entries:

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