How children are helping in the efforts to develop a coronavirus vaccine

Children are voluntarily rolling up their sleeves for a vaccine trial.
4:37 | 10/24/20

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Transcript for How children are helping in the efforts to develop a coronavirus vaccine
with a look at how children are rolling up their sleeves in the efforts to develop a coronavirus vaccine. That's as others are fighting off lingering effects of the virus. ABC's David Wright has more. Reporter: 13-year-old Maggie Flannery is a covid-19 long hauler. I try to just focus on the days that I do feel very good. Reporter: She's had plenty of ups and downs since first testing positive. For some people it's a lot worse than others. It's scary as a parent. She was very, very sick for Reporter: More than 740,000 children have tested positive since the pandemic began. About 10% of the total. While the disease can still be deadly the mortality rate is dramatically lower among children. So despite the pressure to re-open schools, officials say most of the vaccines being developed will go to seniors first. First like took my nasal swab, the swab up your nose. And then they took the blood test which actually hurt less than expected. And then they gave me the vaccine. All done. Reporter: But as Cincinnati's children's hospital 12-year-old abinav and his dad are volunteering in a pfizer vaccine trial. I'm happy to see him doing his part. Reporter: So is 16-year-old Kaitlyn Evans willingly putting herself at risk for the rest of us. I'm just hoping that they can use whatever they get from me and that it helps them put out a vaccine as soon as possible. Reporter: Hoping to help others like Maggie. I'm so much better now than I was a couple months ago so I'm hopeful in a couple of months I'll be able to go back to all the stuff I was doing last year. Reporter: For "Good morning America," David Wright, ABC news. Thanks to David. Let's bring in Dr. Larry Corey, a virologist in Seattle. He's also the head of the national institutes of health vaccine clinical trials network. Doctor, good morning, thanks for let's start by ask something it absolutely necessary to test these vaccines on children? As a parent, I see these pictures and get worried for the kids. Well, yes, it's incredibly important that we understand how these vaccines work in children. You know, safety, of course, is the utmost importance. We expect some of the vaccines's platforms have been better for others than children. The program at Cincinnati is just being initiated. We need to generate enough safety data and understand what is the dose we give children before we start giving widespread use of young and older children and before we vaccinate our own kids and my grandkids. So we need to test it on children so that we can deliver it safely to the rest of the children in America and around the world. So I get that. But as you're testing it on these children are there specific safety concerns that need to be addressed? Well, of course, once you find out the local reactions, are there fevers and other things we see with vaccines, what's the best dose to use in children? Maybe use a slightly lower dose in children. That gets a good immune response that we think will be the kind of protective response we would see in adults in which we're actually testing the effectiveness. Let me ask a bit of a broader question here. Even before a vaccine or vaccines are approved we already know many people are saying that they don't want to take the vaccines. They don't trust it. So what needs to be done to ensure public trust here? Well, public trust needs transparency. We need transparency of the scientific information from the clinical trials we're doing, just how good are the vaccines, do they work in the populations I identify with? Can we assure that the advisory commitments associated with how vaccines are utilized in our country, agree with the discussion to provide whether it's expanded use or emergency use authorization or the actual licensure of the drugs of the vaccine? The physicians of the country support its use. It's clear that the process approval was free of politics. We want our politicians to arrange that the vaccine gets covered and paid for and distributed free, but, frankly, that's all we want them to do. We want to listen to the expert committees. We have a very tried and true regulatory process that has been developed over the last 50 years in vaccines and know that it works and want to make sure it tense to work for covid-19 vaccines. Dr. Larry Corey, really appreciate your insight on a Saturday morning.

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

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