Figure 5: Estimated average dose size for respiratory droplet transmission between ferrets.

Individual infectious doses sizes were assumed to be Poisson distributed, and not be less than one (see material and methods for the statistical analysis). Estimate of the average dose size using data from experiment 1 (4 donor/RD sentinel pairs) and 2 (2 donor/RD sentinel pairs) shown in solid black line. Estimate using data only from experiment 1 shown in grey.