WHO warns world won't achieve coronavirus herd immunity in 2021

World Health Organization chief scientist Soumya Swaminathan warned Monday herd immunity is unlikely to be achieved this year despite COVID-19 vaccines being rolled out.

The big picture: Mass coronavirus vaccinations are under way in the U.S. and across the world. Moderna said Monday its vaccine would provide immunity against the virus for at least a year. But Swaminathan told a briefing even if immunity "happens in a couple of pockets, in a few countries, it’s not going to protect people across the world" in 2021. "It takes time to scale the production of doses," she said.