What happens in BA.2, an Omicron sub-variant, is that S-gene drop-off doesn't happen with RT-PCR. It's also known as 'stealth variant' as it's similar on thermo fisher RT-PCR kit, to what Delta was: Dr Harsh Mahajan, Founder-Chief Radiologist, Mahajan Imaging on COVID strain BA.2 pic.twitter.com/zMrnHXVJvR— ANI (@ANI) January 25, 2022
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