Johnson & Johnson will unblind participants in its COVID-19 vaccine clinical trial, if the shot gets emergency use authorization from FDA, even though the agency remains adamant that there’s no need for vaccine makers to offer vaccines to all placebo recipients once an EUA is granted. In briefing documents published ahead of the agency’s vaccine advisory committee meeting Friday (Feb. 26), J&J says that once its vaccine gets emergency authorization from at least one regulatory authority, the company will amend...