Effectiveness of mRNA COVID-19 vaccines against Omicron and Delta variants in a matched test-negative case–control study among US veterans by Maria C Rodriguez-Barradas, Vincent C Marconi, Yinong Young-Xu, Gabrielle M Zwain, Hector S Izurieta, Caroline Korves, Ethan I Powell, Jeremy Smith, Abirami Balajee, Mark Holodniy, David O Beenhouwer, Sheldon T Brown

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