5 per cent a week ago and 1 per cent in early May, according to new estimates from the Centres for Disease Control and Prevention .
But the overall trend suggests that BA.4 and BA.5 could outcompete the two other Omicron subvariants, BA.2 and BA.2.12.1, which together account for most US cases, said Dr Denis Nash, a public health researcher at the City University of New York Graduate School of Public Health & Health Policy.Data on BA.4 and BA.5, which were first detected in South Africa early this year, remains limited. But these variants seem to spread more quickly than earlier versions of omicron, such as BA.
"How analogous is that for us?" he said."I think it's possible that we could see another wave" fuelled by BA.4 and BA.5. Globally, the most recent data suggests that BA.4 and BA.5 still represent a relatively small share of cases, but that could change in the weeks ahead. The subvariants have become especially common in parts of the southern United States. In the region comprising Arkansas, Louisiana, New Mexico, Oklahoma and Texas, BA.4 and BA.5 account for more than 1 in 5 infections, according to the new figures.
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