What COVID-19 experts know about new Omicron BA.2 subvariant


The highly transmissible Omicron variant now accounts for almost all COVID-19 cases around the world, but a subvariant―Omicron BA.2―has emerged that appears to be even more contagious. Cases of Omicron BA.2 are limited in the U.S., but COVID-19 experts at Mayo Clinic say the number is growing, especially overseas.

“In the U.S., we have identified cases in about half of the states, but it’s about 1% or less of all of the COVID cases occurring. Now take another country like Denmark, where they had very high immunization rates. About 40% to 50% of their cases are this new BA.2 sublineage, so it’s quite variable at this early juncture,” says Dr. Gregory Poland, director of Mayo Clinic’s Vaccine Research Group.

Scientists are tracking the rise in cases of Omicron BA.2, which they say is even more contagious than the original Omicron variant, which is also known as BA.1.

“The best estimates are that it’s about 1 1/2 times more infectious or transmissible than Omicron was. And, remember, Omicron was quite a bit more transmissible than delta, which was more transmissible than alpha,” says Poland.

He says the good news is that Omicron BA.2 does not seem to cause more severe illness than the original Omicron variant.

“This is early, (but) there does not seem to be evidence that it may be more virulent. That is, it does not cause any worse disease than the original Omicron strain. And that’s a good thing,” says Poland.

Experts also say that, at this point, BA.2 does not appear to reduce the effectiveness of being fully vaccinated for COVID-19.

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