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The Food and Drug Admin­is­tra­tion’s staff endorsed John­son & John­son’s Covid-19 vac­cine for emer­gency use, a crit­i­cal step in bring­ing a third shot to the U.S. marketplace.The staff report released Wednes­day is meant to brief the FDA’s Vac­cines and Relat­ed Bio­log­i­cal Prod­ucts Advi­so­ry Com­mit­tee, which will meet Fri­day to review J&J’s request for emer­gency use authorization.During sim­i­lar requests by Pfiz­er and Mod­er­na, the agency autho­rized those com­pa­nies’ vac­ci­na­tions one day after the com­mit­tee of out­side med­ical advi­sors backed emer­gency use autho­riza­tion. The com­mit­tee is expect­ed to rec­om­mend J&J’s vac­cine. The FDA does­n’t have …