Summary: Americans fortunate enough to receive vaccines right now, outside of clinical trials, are getting ones made by either Pfizer or Moderna. But newly released data from Novavax and Johnson & Johnson suggests that more vaccines could be on the way. Dan digs into the news and why it matters, especially as COVID-19 variants begin to spread, with Tom Frieden, former head of the CDC. Learn more about your ad choices. Visit megaphone.fm/adchoices
