WHO expects more Omicron data 'within days'

That was faster than the "weeks" the WHO had predicted last week that it would take to assess the data available on the variant after designating it a "variant of concern," its highest rating.

Whether the variant is more transmissible or evades vaccines are some of the major questions that still need answering.

Vaccine developers have said it will take about two weeks to assess whether their shots are effective against it.