Angie Leventis Lourgos, Chicago Tribune Even though Mary Helen Wissinger has been fully vaccinated against COVID-19 since the spring, she avoids indoor dining and going inside public spaces when they appear crowded or the parking lot seems full. The 67-year-old volunteer church secretary is still social distancing to some degree, choosing curbside pickup at big-box stores and takeout at restaurants. âI just try to be overly careful,â she said. âEven though Iâve been vaccinated and I should be OK.â Wissinger lives in Cairo, the southernmost city in Illinois and the seat of the county with the lowest coronavirus vaccination rate in the state.