recorded the highest-ever concentration of ticks carrying a variant of potentially fatal Powassan virus called deer-tick virus (DTV). This rare virus has the potential to cause deadly infections with lasting neurological effects, and officials fear it and other serious tick-borne illnesses may become more common in the future. While many cases of Powassan virus are asymptomatic, those that are symptomatic can be deadly, according to the Centers for Disease Control and Prevention (CDC)(opens in new tab). Initial symptoms include headache, fever and vomiting, with the most severe cases involving neurological complications such as encephalitis (inflammation of the brain) and meningitis....