The latest on the Delta variant

With what has increasingly become a major concern, the variant has already spread to at least 46 states and is responsible for the majority of COVID-19 cases in the U.K. and Russia.
4:16 | 06/20/21

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Transcript for The latest on the Delta variant
We move on to the pandemic and the delta variant a major concern. Spreading to nearly all states in the U.S. In the uk and Russia it's responsible for the vast majority of new covid cases. Trevor Ault S the latest. Trevor, good morning. Reporter: Good morning, whit. The delta variant had been detected in 46 states and the CDC says it accounts for 10% of the new cases in the U.S. The CDC director said she anticipates this will become the dominate strain in the next few months. In some areas it already is. It's fueling outbreaks in vulnerable places like southwest Missouri. Health experts say it's another reason for people to get the shot because the vaccines will work against the delta variant. Millions of people are still hesitant or out right declining. To be clear, one dose of pfizer or moderna will provide you about 33% effectiveness preventing serious illness from the delta variant. You need to either get both shots or the single shot of Johnson & Johnson. We know the delta variant is not just a concern in America. It originated in India. Russia says it accounts for 89% of their new CAS. The uk said they're in the midst of another wave. The delta variant is to blame. President Biden says at this point he thinks too many Americans have been vaccinated for it to be potentially necessary to have more lockdowns, but it has the potential to cost us more American lives. Eva? A reminder this is not over yet. Trevor Ault, thank you. Let's bring in Dr. Jen Ashton. Dr. Jen, thanks for being with us. So many people have asked how effective are the vaccines against the new delta variant? Eva, they're effective. That's the good news. Coming out of the uk we know that right now these vaccines do work. Recent studies showed the pfizer vaccine reduces the risk of hospitalizations -- excuse me -- by up to 96%. It's important for people to realize -- as we heard Trevor say, it's not just one dose. It's two doses and you're not fully protected until two weeks after the second dose. I want to be clear here, Eva. This virus will continue to mutate as long as it spreads. Not only is it a concern in various parts of the world, it's a concern here in the united States among people who aren't vaccinated. Let's dig into the idea of if you only have one dose. What's the difference between only having one dose as opposed to two with this variant? This data comes out of the uk. It was just published in the it showed after one dose of pfizer the reduced risk of hospitalization due to the delta variant is only in the 30% range. You need those two doses. Again, when you're talking about pfizer, you're talking about 28 days later. It's really important to complete the whole regimen. Those clinical trials were there for a reason. That's what's been tested and what's been shown to be effective. With the delta variant spreading so rapidly, many parents are worried about their kids who aren't eligible to get the vaccine. Is there anything those parents can do right now? We're seeing a lot of the country going back to prepandemic. That can't go on with children under the age of 12, especially if they're around people or in communities where there are high unvaccinated rates. The risk is to those people. Unfortunately they'll need to continue the masking and social distancing if the majority of the people they're around are as yet unvaccinated. This virus is very transmissible. If they get it, it's not just an acute risk, it's potential long term risks. Dr. Jen Ashton, thank you.

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

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