On February 15, local time, the WHO pointed out in the weekly epidemiological report of new coronary pneumonia that early research data showed that the BA.
According to the Danish epidemic data, this sub-variant is 30% more infectious than the original Omicron strain BA.1, but the disease severity caused by it is not as high as that of the original Omicron strain. difference.
At present, the Omicron strain has replaced the delta strain as the main circulating strain worldwide. Among the gene sequences of the new coronavirus reported recently in various places, 98.3% are the Omicron strain.
The proportion of the sub-variant BA.2 strain has also gradually increased, and as of February 14, this sub-variant strain has become the main circulating strain in 10 countries and regions.
(Headquarters reporter Zhu He)