Moderna CEO warns Covid-19 shots less effective against Omicron

Omicron - which the World Health Organization (WHO) said carries a "very high" risk of infection surges

Moderna CEO Stéphane Bancel said that it could take months to begin shipping a vaccine that does work against Omicron.

Drugmaker Moderna (MRNA.O) set off fresh alarm bells in financial markets on Tuesday as the firm's chief warned that Covid-19 vaccines are unlikely to be as effective against the Omicron variant as they have been against the Delta version.

"There is no world, I think, where (the effectiveness) is the same level . . . we had with Delta," Moderna CEO Stéphane Bancel told the Financial Times in an interview.