“Extra’s” Billy Bush FaceTimed ABC News chief medical correspondent Dr. Jennifer Ashton, who explained why a vaccine can’t be developed by the fall for COVID-19.

Dr. Ashton said, “You have to do phase one and phase two clinical trials. Assuming they go perfectly well, they take anywhere from six to nine months. Then, you have to be able to manufacture hundreds of millions of doses.”

She also shared an interesting tidbit about men dying at twice the rate of women when they contract the coronavirus.

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