Federal health officials are expanding the search for the new Omicron variant of COVID-19 in the U.S, including at San Francisco International Airport, where there’s increased testing for some international travelers. There’s still a lot we don’t know — Omicron could be a big deal, or it could change very little about the pandemic. Medical experts are currently trying to figure out whether this variant is more contagious, whether it's more deadly, and how the vaccines hold up against it. Guest: Dr. Chaz Langelier, assistant professor of medicine in the division of infectious diseases at UCSF This episode was produced by Alan Montecillo, Ericka Cruz Guevarra, and Carlos Cabrera-Lomelí, and hosted by Ericka Cruz Guevarra.