Omicron Subvariant BA.4, BA.5 Soon To Become Dominant COVID Strain In USA - medtigo


Omicron Subvariant BA.4, BA.5 Soon To Become Dominant COVID Strain In USA

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According to estimates from the Centers for Disease Control and Prevention and US News, a pair of omicron subvariants that began circulating in the United States only recently accounted for more than a third of new coronavirus cases last week. 

BA.4 and BA.5 caused approximately 35 percent of new infections last week, according to CDC data. This is an increase from nearly 23 percent the week before and 15 percent the week before that. 

In the United States, the highly transmissible subvariants have only recently shown signs of widespread spread. 

As BA.4 and BA.5 have increased in prevalence, other omicron subvariants have decreased in the United States. BA.2.12.1, which has been the predominant strain in the United States since May, has decreased from 63% to 56% of cases over the past two weeks. Before BA.2.12.1, BA.2, or “stealth omicron,” was the predominant strain, but it now accounts for less than 10 percent of infections. 

BA.4 and BA.5 do not appear to cause severe disease at this time. In the past month, the United States has averaged over 100,000 new coronavirus cases per day, though this is believed to be a gross underestimate. 

While the number is significantly lower than the previous outbreak, which caused an average of 800,000 new cases per day during its January peak, it is still significantly higher than previous coronavirus lulls. 


It is unknown whether BA.4 and BA.5 will cause an increase in cases, but experts believe they will at the very least result in a longer plateau for the latest coronavirus wave. 

While cases remain elevated, the United States reports an average of fewer than 270 coronavirus-related deaths per day. On the other hand, hospital admissions from COVID-19 are trending slightly upward. 

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