Dr. Dave Micklin, a dentist, was in the first wave of Coloradans to contract COVID-19 in early 2020 and among the earlier sufferers of what's known as long COVID. At the time, Micklin didn't understand what was happening to him. Today, more than two years later, the Louisville resident is still dealing with symptoms and has had to give up much of the life he knew before he got sick, including his dental practice.