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Genome sequencing of Covid positive samples has revealed that Omicron subvariants BA.4 and BA.5 have started replacing the BA.2 alternative that caused the surge in cases of the infection in West Bengal earlier this year, a senior official of the state health department said on Thursday.
According to experts, it is mostly subvariant BA.5, which has features identical to BA.2, that is responsible for the recent spike in coronavirus cases in…
