Intro: It is harder to detect.
Vigilant scientists warn that removing mask mandates will allow the new strain to spread.
"A new World Health Organization study reported that even as COVID-19 cases are falling, BA.2 accounted for 21.5% of all new omicron cases analyzed worldwide in the first week of February. (Omicron cases accounted for more than 98% of sequenced samples around the globe the previous 30 days.)
BA.2 accounted for the majority of cases a week ago in 10 countries, including Denmark, India, China, Guam and the Philippines.
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