A more contagious omicron strain has scientists fearing another COVID-19 surge

The latest COVID-19 surge is winding down, but a new omicron strain may delay a return to pre-pandemic life, scientists warn. The BA.2 strain has caused a resurgence in Denmark and has become the dominant variant in South Africa and other countries. In the U.S., it only accounts for 4% of cases but may be spreading exponentially.

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