RSV — or respiratory syncytial virus — often presents like a mild cold, with symptoms that often include a runny nose, fever, coughing and sneezing. It can be severe, especially for young kids.
“The particular gift of RSV is to get down into the lower respiratory tract — it does that much better than any cold virus — and then spread throughout your body,” said Dr. Frank Rhame, infectious diseases physician at Allina Health. “When you're under 6 months, the tubules [in their lungs] are small. So if they get edematous — if they swell — it's hard for those babes to move air.”