The U.S. Centers for Disease Control and Prevention (CDC) has stated that Omicron subvariants BA.4 and BA.5, which recently lead to a spike in COVID cases in South Africa, have overtaken the so-called "stealth Omicron", becoming dominant in the U.S..
This pair of Omicron subvariant is swiftly sweeping over several countries and has been detected in India too. Experts believe the two are also the COVID variants driving the current surge in the country.
Both subvariants are said to be fast-spreading and as per South African experts, it may even evade vaccines and natural immunity from prior infections.