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Wang SY, Juthani PV, Borges KA, Shallow MK, Gupta A, Price C, Won CH, Chun HJ. Severe breakthrough COVID-19 cases in the SARS-CoV-2 delta (B.1.617.2) variant era. The Lancet Microbe. Elsevier BV; 2022 Jan;3(1):e4–e5.