Moderna's chief medical officer on its blockbuster vaccine news

Moderna Therapeutics today reported a 94.5% efficacy for its COVID-19 vaccine, which needn't be stored at the same ultra-cold temperatures as does a similar vaccine developed by Pfizer. It also said short-term safety concerns, such as headaches and injection site soreness, self-resolved within days, and that it could have 20 million doses available by year-end. Dan speaks with Moderna chief medical officer Tal Zaks about the new data, distribution, politics, and how it was preparing for this moment even before COVID-19 was discovered. Learn more about your ad choices. Visit megaphone.fm/adchoices