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The COVID-19 vaccine developed by the University of Oxford and AstraZeneca wasn't the first to be OK'd by regulators in the U.K.—health officials authorized the Pfizer-BioNTech jab nearly four weeks earlier. And it's not the most effective—Stage 3 clinical trials suggest it prevents COVID-19 symptoms about 70% of the time vs. about 95% for the Pfizer vaccine and a similar one from Moderna (which is authorized in the U.S., but not the U.K.).