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How Many COVID-19 Vaccines Has Trump's Operation Warpspeed Secured?Pfizer/BioNTech and Moderna both account for 100 million U.S. doses each while the U.S. is also set for 500 million doses of the #vaccine being developed by the University of Oxford and AstraZeneca. #coronavirusIt offers 70 percent protection according to trials, though it is believed this can be increased to 90 percent by tweaking the dose. The rest of the U.S. supply is made up of candidates that have not reported detailed testing results and it includes vaccines developed by Johnson & Johnson?, Novavax? and Sanofi-GSK.