What happens if you don’t get your 2nd vaccine dose on time?

Dr. Jen Ashton has answers to viewers’ coronavirus questions.
2:49 | 12/29/20

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Transcript for What happens if you don’t get your 2nd vaccine dose on time?
don't get my second vaccine dose on time? Okay, so we have to extrapolate from what we know from other vaccines. It depends on what you mean by on time, a couple of days or six months late, if it's the latter, this vaccine, too young to know if someone only got one dose and then, oops, they go back six months later what kind of antibody immune response they'll get. So there's a regimen, you know, if you're talking about the pfizer vaccine, you return in 21 days, you want to make that a priority right now, again one two days off probably not a big deal, six months off, who knows. Translation, get your second dose on time, folks. Make it a priority. Second number two here, how many vaccine doses will need to be administered in the U.S. For herd immunity? They're looking at all kind of modeling with input of different kind of data. Dr. Fauci said, 75%, to 80%, and then that number went up a little bit, and then naturally induced immunity from the millions and millions of people who have already had covid-19, right now, epidemiologists said it has to be a significant portion of the American more that is going to be a logistical challenge. Question number three, do we know what the differences are between the uk and south African variants of sars-cov-2? Remember, sars-cov-2 is a strain of coronavirus, other strains, sars, mers, those are strains of the same viral family, then viruses, say with it -- Both: Mutate for a living. So as they undergo those mutations they produce other variants, and now with genetic sequencing, taking the fingerprint of the viral specimen, they have determined that there's a strain in the uk that was detected in south Africa, they think it traveled from South Africa to the uk, but to be clear, they are way ahead of the U.S. In their ability to look at their genetic profiles. We're sequencing less than 0.5% of specimens, you can't monitor something if you can't identify it. So we have to get up to speed on that genetic profiling so quick. Every doctor I hear on TV talking about that get worked up. It's challenging, a lot to do and there's a lot to learn. You can continue to submit questions to Dr. Ashton on her agram @drjashton. I do want to turn now and look into a tribeca film festival entry.

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

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