Article content While COVID-19 remains the front-of-mind public health issue, the tri-county health unit is reminding area residents to be wary of Lyme-disease-bearing ticks. When temperatures rise above 4C, ticks will be active, officials at the Leeds, Grenville and Lanark District Health Unit said Tuesday. We apologize, but this video has failed to load. Try refreshing your browser. Health unit issues tick warning Back to video “While not all black-legged ticks in our area carry bacteria that cause Lyme disease, a significant number do, and you cannot tell if a tick is positive by looki...