The U.S. Centers for Disease Control and Prevention (CDC) says it has approximately two strains of B. Verse. 4 at “B. Verse 5 ”of the rapidly spreading mutated strain“ Omicron ”of Corona virus, when combined they account for 52 percent of Corona virus infections in the United States since June 25th.

Two strains, which accounted for more than a third of cases in the United States in the week beginning June 18, were added to the World Health Organization’s watch list in March and classified as strains of concern by the European Center for Disease Control and Prevention. Prevention. .

Some vaccine manufacturers, including Pfizer, Moderna and Novavax, are experimenting with versions of their vaccines that they make to protect against the Omicron mutant.

Pfizer and Moderna say their vaccines are also resistant to substrain, though unlike B. Verse. one ”.