covid-19March 11, 2021 E.U. regulator approves J&J's one-shot Covid-19 vaccine Health experts hope that having a one-dose vaccine will speed efforts to immunize the world, especially given the arrival of worrying new variants in recent months. Related posts U.K.'s Johnson launches mass testing…Do you need a Covid-19…What's behind workers' hesitation to…Fully vaccinated people can travel…Younger Latino men are Covid's…Salmonella infections in eight states…Salmonella infections in eight states…The U.S. isn't losing to…Virus-killing robot tested for use…In Covid fight, Cuba touts…