Enhanced Vaccine Effectiveness during the Delta Phase of the COVID-19 Pandemic in the Medicare Population Supports a Multilayered Prevention Approach.

For COVID-19 breakthrough hospitalization rates ( Figure 5 B), there were highly significant differences in rates for the 85 and over year old beneficiaries compared to the 65–74 years old beneficiaries suggesting that the age differences shown in Table 2 might account for the 2.50-fold (95% C.I. 1.99–2.98) difference in hospitalization rates between January and March Groups shown in Figure 3 B (and Table S6 in Supplemental Materials ). 3.5.

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