There's some big news on the vaccine front...a new round of human trials for a coronavirus vaccine has begun in the United States. Pharmaceutical giant Pfizer and German biotech company BioNTech launched human trials of their potential vaccine this week at several hospitals. If the tests are a success, the vaccine could be ready as early as September for emergency use, with millions of doses available by the end of this year. Philip Dormitzer, Vice President of Viral Vaccine research at Pfizer, joined Cheddar to discuss.