Test negative case–control study of COVID-19 vaccine effectiveness for symptomatic SARS-CoV-2 infection among healthcare workers: Zambia, 2021–2022 by Francis Dien Mwansa, Nathan Kapata, Roma Chilengi, Sombo Fwoloshi, Muzala Kapina, Kunda Musonda, Nyambe Sinyange, Patricia Bobo, Leora R Feldstein, Oliver Mweso, John Simwanza, Warren Malambo, Dabwitso Banda, Young M Yoo, Lloyd B Mulenga, Mazyanga Mazaba Liwewe, Simon Agolory, Jonas Hines

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