covid-19June 7, 2020 ‘No guarantees’: As the world races to find vaccine, human trials offer hope — and dangers Jeff Nearby hopes that the experimental vaccines in research and development will spare others the pain that he and his daughters have suffered. 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…