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. 2021 Nov 6;816:151499. doi: 10.1016/j.scitotenv.2021.151499

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Fig. 3 — Effect of volumetric dose (V_{d-airborne-pre}) reduction on R_cp for Delta and wild-type SARS-CoV-2. The necessary reduction in the number of susceptible contacts (S) to achieve R_cp = 1 is also provided on the secondary Y axis, for reference, calculated as (R_cp – 1)/R_cp.