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The evolving understanding about COVID-19 vaccines and boosters

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15min 21sec
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David Zalubowski/AP Photo
Boxes containing the Johnson and Johnson COVID-19 vaccine sit next to vials in the pharmacy of National Jewish Hospital for distribution early Saturday, March 6, 2021, in east Denver. Volunteers worked with nurses and physicians from National Jewish to administer 2,500 vaccinations of the Johnson and Johnson vaccine that requires a single shot instead of two like the other vaccines.

When talk of getting a COVID booster comes up, it's generally about getting a third shot. That refers to the people who received the two-dose mRNA vaccines from Pfizer and Moderna. But what about the people given the Johnson & Johnson "one and done" shot? Dr. Anju Mehta is a critical care and ICU physician at Denver Health. He’s also advised the state on vaccine allocation and Crisis Standards of Care.