Moderna CEO says vaccines likely less effective against Omicron

SYDNEY, Nov 30 (Reuters) - The head of drugmaker Moderna (MRNA.O) said COVID-19 vaccines are unlikely to be as effective against the Omicron variant of the coronavirus as they have been previously, sparking fresh worry in financial markets about the trajectory of the pandemic.

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

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