Mutated variant Omicron sparks global fear

A pandemic-weary world faces weeks of confusing uncertainty as countries restrict travel and take other steps to halt the newest potentially risky coronavirus mutant before anyone knows just how dangerous the Omicron variant really is.

Scientists have little data yet on whether omicron causes more severe disease than other variants. And while it already has been diagnosed in numerous countries just days after its discovery was announced, it's also too soon to know how contagious it is.

Watch this report to know whether Omicron is more dangerous than other variants? How do viruses mutate? What does mutation mean for vaccines?