Columbia University, where a study says that both these sub-variants are similarly efficient in resisting neutralizing antibodies in people who had been previously infected or vaccinated.
Sometimes as the virus mutates into variants, it branches off or splits into sub-variants or sub-lineages.
But the organization said than previous Covid variants.
But if used too soon, for too long, and in high doses, they can cause a rapid deterioration in individuals and increase the risk of that we saw after the second wave.
Angelique Coetzee, a South African doctor who helped discover omicron, in late November that the early symptoms she saw in patients included fatigue, headache and a scratchy throat, she said, not the telltale loss of smell or a cough associated with earlier COVID-19 infections.
Monoclonal antibodies may have a role in high-risk individuals once they have been detected with the infection.
Although experts predicted this gap in hospitalization and death data, it reflects the unmoving reality than many people are still dying from COVID-19.
According to Walensky, the CDC director, the US is now testing 80,000 positive COVID-19 samples per week about one in seven positive tests ,.