Earlier this fall, the FDA granted emergency use authorization for a treatment known as convalescent plasma therapy. Blood donated by people who've recovered from COVID-19 is used in patients who are ill and not responding to other treatments.

Since March, Dr. Karan Omidvari has been on the COVID-19 frontlines as a pulmonologist at Hackensack University Medical Center.

"I was actually what we call the screener. I was the guy who would go in and see them and see which ones needed to come to the intensive care unit," said Omidvari.