covid-19October 28, 2020 A weak Covid-19 vaccine is good enough, some scientists say. Others disagree. Vaccines capable of preventing any coronavirus symptoms should qualify for widespread use, some experts say. Others want larger trials. 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…