Genomic sequencing looks for features that uniquely represent the variant. For instance, experts can quickly identify the original Omicron (BA.1) due to its “S gene target failure.”
“Stealth” Omicron or BA.2 doesn’t have this specific genetic feature.
Does That Mean We Cannot Identify Stealth Omicron at All?
BA.2 may not have S gene target failure, but health officials say we can still detect it. The technicians in the laboratory may just need more time to identify it.
Being stealthy also doesn’t mean that PCR tests give false-negative results. If you have a stealth Omicron infection, standard COVID-19 testing will still give you positive results.
Where Has BA.2 Spread?
We may only be hearing more about stealth Omicron now, but reports say dozens of countries have already detected it back in November 2021 — around the same time the original Omicron variant was discovered. By January 2022, it had spread to 49 countries.
In the United States then, numbers remained low. But the cases were higher in Europe and Asia. In fact, stealth Omicron appears to have gained ground in Sweden, Denmark, the United Kingdom, and India then.
Comments
Share your thoughts
Be the first to let Hello Doctor know your thoughts!
Join Us or Log In to join the discussion