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Omicron’s BA.2 sub-variant is now causing more than a third of new omicron cases worldwide.
However, scientists are still learning about “stealth omicron,” and the World Health Organization (WHO) said this week that the agency’s Technical Advisory Group on SARS-CoV-2 Virus Evolution determined the strain should continue to be considered a variant of concern and be monitored by public health authorities.
Vaccines appear just as effective against the sub-variant according to early research.
One estimate suggests BA.2 s about 30% more contagious than the original omicron.
BA.2 has been found in more than 80 countries, renovare ap 2 camere as well as across all 50 U.S. states.
The WHO has reported BA.2 as dominant in 19 countries, representing about 36% of sequenced omicron cases submitted in the most recent week to a publicly available international database.
According to the Centers for Disease Control and Prevention (CDC), BA.2 caused about 4% of coronavirus cases in the U.S. during the week ending on Feb. 19.
While COVID-19 cases continue to fall – including in some places where BA.2 is prevalent – it is difficult for researchers to predict how much BA.2 will change caseloads because it is spreading in communities with varying levels of protection from vaccines and prior infections.
The Associated Press contributed to this report.
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