Estimated public health impact of concurrent mask mandate and vaccinate-or-test requirement in Illinois, October to December 2021

Table 3 Estimated cases and hospitalizations averted by the vaccinate-or-test requirement for different increases in vaccination uptake

Percentage point increase in vaccination between 8/22 and 10/17 in population due to the vaccinate-or-test requirement (number of people this percentage represents)^a		Number Averted
5.6 percentage point (51,580)	Cases	11,571
5.6 percentage point (51,580)	Hospitalizations^b	234
11.1 percentage point (103,160)	Cases	23,593
11.1 percentage point (103,160)	Hospitalizations^b	477

^aNote that we do not know what percentage point can be attributed to the vaccinate-or-test requirement, so the two scenarios here represent examples meant to illustrate what could have happened
^bNumber of COVID-19 hospitalizations averted is calculated by multiplying the estimated number of averted cases by the infection-to-hospitalization ratio (factor of approximately 2.02%) [26]. Infection-to-hospitalization ratio is assumed not to vary with the vaccination coverage

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