Dr. Hotez: COVID-19 vaccine in 12-18 months would be ‘unprecedented’

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Dr. Peter Hotez, a dean at Baylor College of Medicine and co-director of the Center for Vaccine Development at Texas Children's Hospital in Houston, tells Lawrence O'Donnell his team has 200,000 doses of a coronavirus vaccine ready for human clinical trials. But, Dr. Hotez explains why a 12-18 month timeline for a vaccine would be "unprecedented.”