The different mobility and propagation parameters tested in this model.

We selected 9 different velocities v and 5 different values for the remaining parameters, including the initial proportion of PI nI,0, the airborne transmission distance d, the infection probability pSE, the conversion probability of Day 7 pEI,Day7 from PE to PI, and the recovery probability pIR. Those marked with * are the default values. In each change of one parameter, the default values were used for the other parameters. For each set of parameter combinations, we calculated 5 random motion trajectories of agents at 40 days length separately using the CDD model and postprocessed each trajectory using the SEIR model to obtain 5 independent modes of transmission. The final reported results were extracted from the average of 5*5 = 25 trajectories.