covid-19February 22, 2021 Pharmacists say 'heartbreaking' waste of Covid vaccines has a simple solution The FDA says leftover Covid-19 vaccine cannot be combined because neither Moderna’s nor Pfizer’s products contain preservatives to prevent contamination. 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…