The Omicron variant appears to be no worse than other coronavirus strains, top scientists from the WHO and the United States told AFP, while cautioning that more research is needed to judge its severity.

While it is likely more transmissible than previous variants, Omicron is also “highly unlikely” to completely evade vaccine protections, the World Health Organisation's second-in-command told AFP.

“The preliminary data doesn't indicate that this is more severe. In fact, if anything, the direction is towards less severity,” WHO emergencies director Michael Ryan said in an interview, insisting though that more research was needed.

Top US scientist Anthony Fauci echoed the WHO's view, saying Omicron did not appear worse than prior strains based on early indications — and was possibly milder.