A respiratory virus called RSV has a lot of kids in critical condition and hospitals overwhelmed. Vox public health reporter and epidemiologist Keren Landman explains newfound hope for a vaccine. This episode was produced by Victoria Chamberlin, edited by Matt Collette, fact-checked by Laura Bullard, engineered by Paul Robert Mounsey, and hosted by Sean Rameswaram. Transcript at vox.com/todayexplained   Support Today, Explained by making a financial contribution to Vox! bit.ly/givepodcasts Learn more about your ad choices. Visit podcastchoices.com/adchoices