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- [31] Preliminary Estimates of Effectiveness of Monovalent mRNA Vaccines in Preventing Symptomatic SARS-CoV-2 Infection Among Children Aged 3-5 Years-Increasing Community Access to Testing Program, United States, July 2022-February 2023 MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT, 2023, 72 (07): : 177 - 182