Winter is upon us – and with the holiday travel and time spent indoors comes a triple threat of respiratory diseases: RSV, flu and COVID-19. Most of the country has been experiencing high or very high respiratory virus levels, according to the Centers for Disease Control and Prevention. Host Regina G. Barber talks with NPR health correspondent Pien Huang about the annual 'tripledemic': what makes this winter different from winters past, who's most at risk and whether or not we're over the seasonal surge. Want to hear about another health story making headlines? Email us about it at shortwave@npr.org — we might cover it on a future episode!