The country’s authorities have decided to consider the omicron strain an “option of concern.”

Mutations that have been identified in the Omicron strain of coronavirus may indicate its resistance to existing vaccines. This was reported by the Federal Centers for Disease Control and Prevention (CDC) of the United States.

A report published on the regulator’s website indicates that the U.S authorities have decided to consider the omicron strain “an option of concern,” since “mutations of the virus may indicate a decrease in the effectiveness of COVID-19 vaccines and certain types of monoclonal antibody treatment.”

The CDC notes that so far “no cases of this variant have been detected in the United States.”

On November 26, the World Health Organization designated a variant of coronavirus B.1.1.529, found in southern Africa, with the Greek letter Omicron. In a statement, the organization said that this variant of the coronavirus “has a large number of mutations, a number of which are of great concern.” Several changes in the spike protein at once can potentially make it difficult to neutralize the pathogen with antibodies, which can affect the effectiveness of vaccines. In addition, according to preliminary data, the strain has an increased ability to spread.