Dr. Sanjay Gupta looks at the leading theories on COVID's origins and talks to scientists who have spent lifetimes studying viruses to uncover what people know about the origins of the disease that launched a global pandemic.
Dr. Sanjay Gupta looks at the leading theories on COVID's origins and talks to scientists who have spent lifetimes studying viruses to uncover what people know about the origins of the disease that launched a global pandemic.
