COVID-19: BA.4, BA.5 Omicron subvariants make up 13% of all US cases
BA.4 made up 5.4% of the variants in the country for the week ending June 4, according to CDC estimates, while BA.5 made up 7.6% of the variants during the same time.
The coronavirus Omicron variant (illustrative).(photo credit: PIXABAY)ByREUTERS