The BA.2 Omicron subvariant is now dominant in northeastern US states, per CDC data. Some experts warn of an impending new wave.
- A map shows how
BA.2has outcompeted other types of Omicronin the northeastern US.
- The subvariant has driven a new surge of cases in Europe.
The Omicron BA.2 subvariant has become dominant over other
The news comes as a surge of new cases have hit Europe, driven by the more-contagious BA.2 and by countries lifting COVID-19 restrictions. That surge is prompting some experts to worry that another wave could soon be coming to the US.
Experts previously told Insider that they expect a wave of BA.2 in the US could be milder than in Europe, in part because of previous exposure to its cousin, the subvariant BA.1. More vulnerable groups could still be at risk, the experts said.
As of last week, BA.2 made up 55.4% of samples collected in Health and Human Services Region 1, the CDC said Tuesday. This region covers Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont, as well as ten federally recognized tribal nations.
BA.2 also made up 51.8% of samples in HHS Region 2, which covers New Jersey, New York, Puerto Rico, and the US Virgin Islands.
The rest of the
According to estimates from the CDC, the subvariant already makes up about 35% of all cases in the US.
BA.2 is thought to be more contagious than BA.1, the subvariant of Omicron which is still dominant worldwide. However, it is not thought to be more dangerous than other Omicron variants.
It is not yet clear whether BA.2 will cause a huge surge of cases in the US, Insider previously reported.
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