J&J Sees Decision on Vaccine Clearance Coming by March

Johnson & Johnson’s highly anticipated single-dose Covid-19 vaccine may not be authorized for use until March, weeks later than U.S. officials have suggested.

Operation Warp Speed officials have said they believe that the shot could receive emergency clearance from U.S. regulators as soon as the middle of next month. But that timeline may be aggressive, based on the drugmaker’s expectations for when it will have reliable data in hand demonstrating the one-shot vaccine’s efficacy.

J&J will first have its chance to analyze late-stage data in the last week of January or the first week of February, Chief Scientific Officer...