The Division of Environmental Health Services’ (DEHS) Mosquito and Vector Control Program (MVCP) confirmed that two adult western black-legged ticks collected on January 29, 2015, tested positive for a bacteria that may cause Lyme disease in humans. MVCP routinely checks for the presence of this bacteria in local ticks within the County. The ticks were collected about 4 miles north of Yucaipa along Highway 38 on a hiking trail. This marks the first finding of the bacteria during a tick survey in San Bernardino County since 1991. The MVCP will continue to survey this and other areas to assess Lyme disease risk to San Bernardino County residents and visitors. View the News Release.