How were Pfizer and Moderna able to develop a COVID-19 vaccine so quickly?

Dr. Jen Ashton answers viewers’ coronavirus questions.
1:40 | 11/23/20

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Transcript for How were Pfizer and Moderna able to develop a COVID-19 vaccine so quickly?
Dr. Ashton has the answers now to what you actually do need to know. Your covid-19 questions. The first one, if you have antibodies against covid-19, should you still get the vaccine? Short answer is, you probably won't be able to initially. Because people who are positive for covid-19 antibodies are ex. -- we have said many, many times, we don't know how long those antibodies will persist, so it's very likely that down the road, two years, three years from now, we might start to see those indications as they're called by the fda evolve and change, but right now, if a person wasn't involved in the clinical trials, they won't be on label for getting these vaccines. All right, next question, I knowlu vaccine gives the unborn baby immune protection in in the yut Rees and several months after birth, will this be the case with the covid-19 vaccine? So we don't know lot of these vaccines in pregnant women. Pregnant women haven't been formally enrolled in these clinical trials. In speaking to vaccine developers and top infectious disease specialists, pregnant women and young children will be enrolled as early as January, possibly, but the beginning of 2021. Because we need to study these specific groups in terms of safety and efficacy, but part of the reason the flu vaccine is protective is because of that cocoon effect. It's hard for a newborn to get influenza if their mom doesn't get influenza. All right, doc, thank you so much. Your questions, keep them coming, to Instagram.

This transcript has been automatically generated and may not be 100% accurate.

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