CA
United States
Kaiser Permanente Southern California
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omicron, effectiveness, waning, booster, third dose, BNT162b2, SARS-CoV-2, COVID-19, United States, test-negative, kaiser
BA.2, BA.1, omicron, effectiveness, BNT162b2, SARS-CoV-2, COVID-19, United States, test-negative, Kaiser Permanente, real-world
Natural language processing, Public health surveillance, SARS-CoV-2, artificial intelligence