covid-19January 11, 2021 Covid vaccine sites need to be ready for rare reactions, officials say Health care workers should be trained to spot the warning signs and have equipment to respond swiftly if something goes wrong, officials say. 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…