AstraZeneca has resumed the US trial of its experimental Covid-19 vaccine after approval by regulators, and Johnson & Johnson is preparing to resume its trial on Monday or Tuesday, the companies said on Friday.
AstraZeneca, one of the leading vaccine developers, paused its US trial on September 6 after a report of a serious neurological illness, believed to be transverse myelitis, in a participant in the company’s UK trial. J&J paused its large, late-stage trial last week after a study participant became ill.
Both companies have contracts to provide vaccine to the United States and other governments if they are cleared by regulators.
AstraZeneca’s vaccine is in partnership with Oxford University.
Here’s how scientists develop a vaccine: