Nine drugmakers said Tuesday their chief executives signed a pledge promising not to file for regulatory approval or authorization of their experimental Covid-19 vaccines until the shots have been shown to work safely through late-stage clinical testing. The pledge was signed by the heads of AstraZeneca PLC, GlaxoSmithKline PLC, Johnson & Johnson, Merck & Co., Moderna Inc., Novavax Inc., Sanofi SA, BioNTech SE and Pfizer Inc.
