The two newest subvariants of Omicron, BA.4 and BA.5, are spreading across the US and making up a higher percentage of new cases, prompting concerns about increased transmissibility. WebMD Health News
The two newest subvariants of Omicron, BA.4 and BA.5, are spreading across the US and making up a higher percentage of new cases, prompting concerns about increased transmissibility. WebMD Health News