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Columbia University experts have taken a deep dive into how COVID-19 has changed society.

USA TODAYUSA TODAY

A new variant of COVID is making its way across the U.S. and is spreading more quickly in the Northeast and West.

According to the U.S. Centers for Disease Control and Prevention, the BA.2 variant has doubled each week for the last month.

The World Health Organization considers BA.2 to be a sublineage of the highly transmissible omicron variant. The surge that hit the Northeast late last year was caused by a different version of omicron.

It was dubbed the "stealth variant" because it wasn't as easy to detect.

The BA.2 version of omicron is the main cause of infections around the world. The CDC says that BA.2 accounted for 22% of the cases for the week ending March 12. It was 14.2% the week ending March 5.

How worried should Americans be about another wave?

There is a new variant of COVID called Deltacron. Here is what we know about it.

How fast is BA.2 spreading in the US?

The CDC says that BA.2 made up 39% of cases in New Jersey and New York in the week ending March 12. Puerto Rico and the Virgin Islands are included by the CDC in their COVID case breakdown.

In the Northeast, BA.2 accounted for 38.6% of cases, up from 24% the previous week.

In the West, BA.2 accounts for 27.7% of cases, up from 17.1% the previous week. In the upper West, including Alaska, Idaho, Oregon and Washington, BA.2 made up 26.2% of cases, up from 16%.

12% to 20% of cases in other states for the week ending March 12 were BA.2 cases.

Does BA.2 spread faster? Is it more lethal?

According to the World Health Organization, studies have shown that BA.2 is more transmissible than omicron BA.1.

If omicron BA.1 causes severe illness as did BA.2 it will prompt a rapid surge in cases, hospitalizations and deaths for a month before falling just as quickly.

Omicron BA.1 was considered milder than the original strain and the delta variant, which led to an increase in deaths in the U.S.

We don't know until it's too late, and that's been the problem with managing these surge Deaths are one of the last impacts we see.

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What impact is BA.2 having?

It doesn't look like BA.2 is making a difference. Public health officials are watching its spread.

The key COVID metrics such as cases, hospitalizations and deaths have not changed much since the July surge.

After deaths of 3,000 or more daily for much of January and February, the daily reported deaths have ranged from 1,685 to 2,076 in March.

The lifting of state mask mandates in schools and public buildings is considered a return to normal by officials.

The governor of New Jersey said on Thursday that he expects cases to rise in the state due to the increase in cases in Asia and Europe. He doesn't expect to restore universal statewide mandated protective measures.

Health officials are not sure what BA.2 will do.

It is difficult to predict how COVID-19 variant or any other emerging respiratory virus will evolve over time and what their specific impacts will be.

Are vaccines and natural immunity effective against BA.2?

British scientists found that vaccines were as effective against BA.2 as they were against omicron BA.1. The vaccines work well in fending off illness, but they don't prevent infections.

According to the World Health Organization, if you were exposed to omicron BA.1, you may have good protection against BA.2.

Studies suggest that an infection with BA.1 provides strong protection against reinfection.

The hundreds of thousands of infections in New Jersey during the omicron surge suggest that many residents may have some protection against BA.2, said Tan.

What's happening in other parts of the globe?

There has been a rise in cases in Europe and parts of Asia in the past few weeks.

The United Kingdom, the Netherlands, Germany, Switzerland and Italy saw an increase in activity last week. Many European countries have begun treating the virus as a part of daily life.

The public was urged not to leave Beijing last weekend after a new spike, and the city of Changchun was locked down.

Hong Kong has seen its worst spike in recent weeks after limiting COVID's spread for almost two years with some of the world's most stringent health mandates. More than one million infections and 4,200 deaths have been reported in Hong Kong in the past three weeks.

Will other variants emerge?

The more times a virus replicates, the more chances it has to evolve into a stronger strain.

Some public health experts are worried about the surge in Asia.

The emergence of new strains of virus in places that are experiencing major waves of omicron will be a worry for Daniel.

Karen Weintraub is contributing.

You can follow Newsfallon andmikesnider.

The original article was on the USA TODAY NETWORK.

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