WHO: Not yet known whether Omicron leads to more severe disease

• The WHO named Omicron "a variant of concern" based on evidence that the strain possesses significant mutations that may evade immune systems and drive a new wave of infections.
• The agency reiterated that preliminary data suggests there may be a "higher risk of reinfection" with Omicron, adding that the "number of people testing positive has risen in areas of South Africa affected by this variant."

What they're saying: "Researchers in South Africa and around the world are conducting studies to better understand many aspects of Omicron," the organization said in a statement.

• "There is currently no information to suggest that symptoms associated with Omicron are different from those from other variants," it continued.
• "WHO will continue to provide updates as more information becomes available."

Go deeper: Fauci: Omicron variant will "inevitably" be found in U.S.