Fauci: 20% of all US COVID-19 cases are delta variant

Dr. Anthony Fauci said the delta variant is currently “the greatest threat in the U.S.” in the fight against COVID-19. Officials warn that younger people could be more vulnerable to the variant.
3:13 | 06/23/21

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Transcript for Fauci: 20% of all US COVID-19 cases are delta variant
We're going to begin with the coronavirus here in the U.S. And Dr. Anthony Fauci saying this delta variant is now the single greatest threat in trying to end this pandemic. The white house tonight acknowledging the U.S. Will not reach that fourth of July goal to have 70% of adults with at least one dose. Dr. Fauci saying late today we'll likely hit that mark a couple of weeks after the fourth. Tonight, the numbers here. 168 million adults have had at least one dose. That's about 65% now of those 18 and older. And the white house pointing out, with adults 30 and older, they've hit the goal, that it's really getting to those younger adults, younger than 30, to convince them to get the vaccine and to take this delta variant seriously. In fact, authorities saying it has doubled in the U.S. In just two weeks. And we have just learned tonight that more than 150 employees of a houston-based hospital system have now resigned or were terminated for refusing to be vaccinated. ABC's Victor Oquendo leading us off tonight. Reporter: Tonight, officials are calling the highly con stay use delta variant the greatest threat in our fight against the virus, now accounting for 20% of new cases across the country and it's doubling every two weeks. It's more important than ever to get vaccinated now to stop the chain of infection. Reporter: That strain now in at least 47 states, accounting for nearly half of all infections from Iowa to Colorado. In northwest Missouri, the delta variant coupled with low vaccination rates leading to a spike in cases and hospitalizations. I hoped it would be different by now, we would be vaccinated, we be on with our lives. Reporter: Officials warning that younger people across the U.S. Could be more vulnerable to the variant. Only 38% of 18 to 29-year-olds have received at least one dose. The reality is, many younger Americans have felt like covid-19 is not something that impacts them and they've been less eager to get the shot. Reporter: Today, the Biden administration saying it may take longer than expected to reach their goal of vaccinating 70% of American adults by the fourth of July. We think it will take a few extra weeks to get to 70% of all adults with at least one shot, with the 18 to 26-year-olds factored in. Reporter: They're now calling that goal aspirational. That's not the goal line. That's the aspirational goal. The goal line is to completely crush this outbreak. So, no one should think when we reach this 70% across the country that we're done. Some taking measures into their own hands. On the ground in Florida, pastor Marcel Davis going door-to-door. How you doing, ma'am? Reporter: Trying to find and cown Vince those who have yet to get a shot. Have you been vx noted? I want to encourage young people to, yes, wake up. Be woke and know the consequences. I've got to two dozen funerals of people who have had covid but they've not been to any funerals of someone who died from the vaccine. Reporter: And today was also the deadline for employees at Houston methodist to comply with a mandatory covid-19 vaccine 153 employees have either resigned or were terminated, but that's just a small portion of the hospital system's employees. They have 26,000 of them. Victor, thank you. And now to that key vote just moments ago in Washington.

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

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