CRYSTAL LAKE – At Yoga Seva, owner and instructor Ann Waring noticed that class attendance dropped as flu season arrived.

At the downtown Crystal Lake yoga studio “cleaning everything down,” such as disinfecting mats before and after classes, is the protocol in all seasons, Waring said. But the flu season has heightened sensitivity about spreading the virus to others.

“Attendance has been low recently,” Waring said. “And nobody’s coming in with obvious symptoms. Previously, there might have been some who would show up with lingering coughs. It seems like more recently, they would stay away. That’s been my experience.”