Sub-omicrons are very contagious called BA.2led to an increase in coronavirus cases in Europe, which is now the predominant version of the virus in new cases in the United States, by estimate from the Centers for Disease Control and Prevention on Tuesday.
Last week, the World Health Organization repeat that BA.2 is domination version of Omicron around the world, and Dr. Rochelle Walensky, director of the CDC, said she predicts it will soon become dominant in the United States of America.
The scientists tracked down BA.2, one of three genetically distinct varieties of the Omicron variant of the coronavirus, discovered by South African researchers in November.
BA.2 is determine first in the United States in December, and it accounted for about 55 percent of new U.S. cases in the week ending Saturday, according to CDC estimates on Tuesday. The figures are rough estimates that may be revised as more data becomes available. like it happened in late December, when the agency had to significantly reduce its estimate of the nationwide prevalence of the BA.1 Omicron variant. Before that, the Delta . variant dominated since July.
Omicron cases can only be confirmed by genetic sequencing, which has been performed on only a fraction of the sample nationwide. CDC estimates vary in different parts of the country. BA.2 was found in a high proportion of samples in the Northeast and a lower proportion in the Midwest and Great Plains.
BA.1, became dominant at the end of December, which was almost entirely responsible for the record spike in US cases this winter, but earlier this year, BA.2 began to account for a larger proportion of new infections. Its rapid growth is due to one to eight mutations in the gene for viral surface spike protein, not found in BA.1.
Although BA.2 is more contagious than BA.1, it has not been shown to cause more severe illness and the vaccine continues to protect against the worst outcomes. Many US health officials have said that they expect the number of cases to increase do not have a big surge caused by BA.2But other scientists worry that the country is not doing enough to prevent another possible surge.
In the US, the seven-day average of new cases has fallen significantly from the high rise of Omicron BA.1. According to a New York Times Database.
The number of hospitalizations due to covid has plummeted in the past two weeks by about 35%, to about 18,000 a day. The number of intensive care unit admissions also fell – by about 42%, to less than 3,000.
And about 750 deaths from coronavirus are being reported every day in the United States, the lowest daily average since before the Omicron variant took hold late last fall. The last time it was this low was in mid-August.
In some European countries, the rise of BA.2 coincided with an increase in new cases. In the Asia-Pacific region, Hong Kong, south Korea and New Zealandall are relatively untouched compared to the previous variants, which are now filled by BA.2.
Vaccines continue to protect people against serious illness, especially the enhanced onesExperts have repeatedly said.