covid-19February 19, 2021 Pfizer vaccine may offer strong protection after first dose, Israeli study finds The Covid-19 vaccine developed by Pfizer and BioNTech is 85 percent effective at preventing symptomatic Covid-19 after one dose, according to a new study. 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…