New warning from Dr. Fauci about potential effectiveness of COVID-19 vaccine

Dr. Anthony Fauci announces a new warning about the effectiveness of developing a COVID-19 vaccine as cases top 6.3 million around the world.
1:40 | 06/03/20

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Transcript for New warning from Dr. Fauci about potential effectiveness of COVID-19 vaccine
Well now to breaking news overnight on the development of the covid-19 vaccine from Dr. Anthony Fauci with some words of caution about whether it will be effective in the long term as cases around the world top 6.3 million with at least 380,000 deaths. I'm concerned a little bit more about what the durability of response that I am about whether you'll get protective response because if you look at the duration of protection when you recover from one of the several benign coronaviruses that cause the common cold, the durability of protection is only measured, you know, in the year or less. And our Dr. Jen Ashton joins us now. So, Dr. Ashton, what do you make of Dr. Fauci's concerns? Well, Amy this, is a perfect example about how science works. It's not all or none. But three issues he's speaking to about concern, one, durability. How long that immune protection will last. Other coronaviruses tend to hover around a year so that's a factor. The second factor is ironic as we go into phase three clinical trials where we need to test 30,000 people. If the natural rate of this virus in the community or in the population goes down, it makes it more difficult to test 30,000 people and lastly, for some historical perspective here, Amy, there has never been a coronavirus developed for humans and the previous fastest time record to development for any vaccine, four years. Wow, that is a staggering difference between less than a year. Dr. Jen, thank you so much as always.

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

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