BA.5 Omicron Subvariant is now dominant in the US
CDC data show another new secondary variable, BA.4, accounting for 12.8% of new infections.
Two infectious sub-strains now account for more than 90% of new infections in the United States.
CDC data shows that confirmed cases contracted with two extra variables continue to increase since mid-May.
Two sub-variants are more contagious than the earlier variants of Omicronand also seems to evade protection from vaccines and previous infections more easily than most previous vaccines, according to health experts.
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