(Bloomberg) -- Covid-19 cases surpassed 24 million worldwide with South Korea, Italy and France reporting the most new infections in months. A shift in guidelines on U.S. testing drew criticism from state leaders and public-health experts, while a top Trump administration official defended the move.

Moderna Inc. presented new safety data from an early trial that provides the first evidence that its vaccine stimulates the immune systems of older people. Abbott Laboratories won U.S. clearance for a 15-minute Covid test that will be priced at just $5.

The World Economic Forum postponed its annual gathering of business and political leaders in the Swiss resort of Davos to early summer 2021. The European Union’s trade chief stepped down after growing criticism that he broke virus regulations in his native Ireland.

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