Doctors are warning of the triple threat of COVID-19, the flu, and RSV overlapping as winter approaches. Dr. Jeremy Cauwels, chief physician with Sanford Health, is recommending the latest RSV vaccine for those at risk this season. It’s a potentially dangerous, highly contagious virus that can cause respiratory disease. Very young children, people over the age of 60, and expectant mothers are the most at-risk. The typical RSV season is from October through March, part of a potentially rough season for illnesses ahead.