In addition, the IRR for severe COVID-19 disease for the zero/single-dose group during the omicron wave was also higher in both the active treatment (1.85) and cancer survivor cohorts (1.56), although this did not reach statistical significance in the active treatment cohort.
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COVID-19 Severity and Waning Immunity After up to 4 mRNA Vaccine Doses in 73 608 Patients With Cancer and 621 475 Matched Controls in Singapore: A Nationwide Cohort Study.
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