Los Angeles County West Vector & Vector-Borne Disease Control District

Locations of Lyme Positive Ticks 

    It should be noted that only a few sites have been confirmed as positive.  However, the species of tick, Western Black-Legged tick (Ixodes pacificus),  that carries the bacterium for Lyme Disease has been  found in other areas throughout the District. Western black-legged ticks have been found in 55 of 58 counties in California.  On average, only about 1-2% of the adult Western Black-Legged ticks in California are infected with the bacterium that causes Lyme disease.  In some areas north of the San Francisco Bay Area, up to 5% of the adult ticks and 14% of the nymphal ticks may be infected: this is still much lower than the northeastern U.S. where 30-60% or more of the adult ticks are infected.


Sites where ticks positive for the Lyme disease bacterium have been found in the District


Click on the links below to view results for Western Black-legged ticks collected in our District