BA.2 numbers around the world are rising, with at least 40 countries reporting cases.
Scientists warn that omicron's whirlwind spread across the globe practically ensures it won't be the last worrisome coronavirus variant.
The evolution of COVID-19 subvariants is not new. The delta variant also had several subvariants, but scientists referred to all of them as delta. BA.2, however, has earned its own designation due to rising numbers across several nations. Conventional COVID-19 tests can show a positive or a negative result, but they can't determine specific variants. For that, scientists need to do additional genetic sequencing. Conveniently, the omicron variant has a particular genetic signature that allows scientists to quickly and easily determine if the sample is omicron or not.
Ultimately, while scientists and public health officials are urging continued research and surveillance, experts say there is little reason to worry.
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