By Madalyn O'Neill Feb 5, 2021 6:23 PM MADISON, Wis. –The coronavirus doesn’t usually get children very sick, but it’s leaving a mark in another way. In August 2019, Bethany and Nate Keiser of Prairie Du Sac opened their hearts and home to two foster siblings, joining their three biological children. “We know no matter what’s going on in the world, it’s a transition and brings new challenges and opportunities,” Nate Keiser said. Then about seven months later, the world closed down. “It was really tough, especially for the first couple months,” he said. It meant cancelled appointments, case manager visits reduced to phone calls and both treatment and school turned virtual.