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/givepodcastsLearn more about your ad choices. Visit podcastchoices.com/adchoices