Estimation of airborne viral emission: quanta emission rate of SARS-CoV-2 for infection risk assessment

Giorgio Buonanno; Luca Stabile; Lidia Morawska

The copyright holder for this preprint . https://doi.org/10.1101/2020.04.12.20062828 doi: medRxiv preprint Table 2 ). The R0 data were calculated for an 295 asymptomatic SARS-CoV-2 infected subject (cv=1×10 8 copies mL -1 ) while standing; in particular, the 296 average ERq value among the different respiratory activities was considered (147 quanta h -1 , Table 297 3). The exposed subjects were also considered to be standing (IR=0.54 m 3 h -1 ). The new regulations and methods of accessing the indoor environments that were applied in the 315 conditions after lockdown (i.e. queuing outside, limited time spent in the environments, lower 316 crowding index) were very effective; indeed, the R0 values were reduced by roughly 80%-90% (for 317 both natural and mechanical ventilation conditions) with respect to the corresponding pre-318 lockdown scenarios. 319