Effectiveness of COVID-19 mRNA vaccine in preventing infection against Omicron strain: Findings from the Hiroshima Prefecture COVID-19 version J-SPEED for PCR center - Yui Yumiya; Kenya Kawanishi; Odgerel Chimed-Ochir; Eisaku Kishita; Aya Sugiyama; Junko Tanaka; Tatsuhiko Kubo (Public Library of Science (PLoS), 2024)