Michelle Barron, an infectious disease expert at UCHealth [and professor of medicine at CU School of Medicine] said the increases come as other respiratory bugs, like flu and RSV (respiratory syncytial virus), are spreading widely. “Respiratory viral season has begun, and it’s begun with a vengeance,” she said, noting cases generally trend upward as the weather cools and people spend more time together indoors. “It’s what we see with the changing seasons, right?”