Health officials around the world are closely monitoring a new Omicron subvariant that has been found in at least 40 countries, including nearly 100 cases in the US.The variant, BA.2, is one of at least four descendants of Omicron that has been detected, and it has already become the dominant form of the virus in Denmark.It is widely being dubbed “stealth Omicron” because of a genetic trait that makes it harder to detect.
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