CDC: UK strain now dominant COVID-19 strain in US

Some experts fear the highly contagious COVID-19 U.K. variant could be the start of a new surge in cases and hospitalizations. Reports say young people are driving new outbreaks.
4:00 | 04/07/21

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Transcript for CDC: UK strain now dominant COVID-19 strain in US
Good evening and it's great to have you with us here on a Wednesday night. And we begin tonight with the coronavirus here in the U.S. Tonight, the CDC is now saying the troubling uk variant is the dominant strain. Tonight, CDC director Dr. Rochelle walensky saying the case counts, these spikes we're seeing, are still way too high to be thinking that we've won this race. The CDC had warned for weeks that the uk variant would become the dominant strain and now it's highly contagious and likely more deadly. Authorities report more cases now among the young in day care, young people in sports and now more people in their 30s and 40s getting sick in several states. They're seeing them hospitalized with severe disease. Hospital admissions are up 10% or more in at least 16 states. But there is some encouraging news tonight. New data involving the modern vaccine indicating antibodies lasting six months out. And Dr. Anthony Fauci on what this could mean for all three vaccines. Tonight, at least 109,408,000 have received one dote. 42% of all adults in this country. ABC's whit Johnson leads us off. Reporter: Tonight, the CDC says the uk variant is the most dominant covid strain in the U.S. Highly contagious, believed to be more deadly. And now fueling what some experts fear could be the start of a new surge. I think we're way too high to be thinking that we've won this race. Reporter: And the CDC increasingly worried about younger, unvaccinated Americans, tracking clusters of cases connected to day care centers and youth sports. Hospitals are seeing more and more younger adults, those in their 30s and 40s, admitted with severe disease. Reporter: Hospital admissions are on the rise in at least 16 states. Cases in Michigan nearly tripling in the last three weeks. Doctors there are seeing many children needing critical care. In Chicago, 18-year-old zamia bell loved dancing. She brought light into the room. Reporter: Her family says she got covid in March, was hospitalized and went into cardiac arrest. Her mom rushing to her side. All I could hear in my head, don't leave me, momma. Don't leave me, momma. Just stay with me. Reporter: But her condition rapidly deteriorating. The high school junior passing away from complications from the virus. Her mother tonight with a warning for other parents. This is not over. This virus is killing, no age to it, no race to it, nothing. It don't care. Reporter: More vaccines are starting to reach younger Americans. 38 states opening vaccinations for everyone 16 and older. I actually was tagged in a post that someone shared on Instagram, so I just quickly hopped on it, because it's very hard to find appointments. Reporter: Those vaccines believed to work against the variants. And tonight, more evidence protection from vaccines will last. New data shows high levels of antibodies at least six months outs from the modern vaccine. Antboies persist at least through six months and likely from the shape of the curve, well beyond that. Reporter: And more than six months into its study, pfizer also reporting its vaccine is highly effective. That was good news, as well. But specifically on antibodies, promising news on the modern vaccine, those anti--ed Bos, Dr. Fauci say todaying he believes that we're going to see this in all three vaccines. And we should point out that this is still very early. The lasting effects could be even longer, whit. Reporter: David, that's Dr. Fauci was specifically talking about the promising new data from the modern vaccine at that moment, but he went on to say that he expects other vaccines like pfizer and Johnson & Johnson will offer similar results and that six-month timeline is all they've been able to study so far. He also thinks that protection will last longer. David? Whit Johnson leading us off tonight. Whit, thank you.

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

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