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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.
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Click on the map above to view sites where ticks carrying the bacterium that causes Lyme Disease have been found in the District.
Below are results for Western Black-legged ticks collected in our district and tested for bacteria that cause Lyme disease
