Omicron BA.2 sub-variant causing COVID resurgence in China, Europe

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As COVID-19 cases decrease in the U.S., China and Europe are both dealing with serious outbreaks. The city of Hong Kong is being hit particularly hard. Some officials believe the uptick is driven by the new Omicron sub-variant known as BA.2. CBS News medical contributor Dr. David Agus has the latest on the surge overseas.