SARS transmission

The transmission of SARS appears to occur predominantly by direct contact with infectious material, including dispersal of large respiratory droplets. However, it is also possible that SARS can be spread through the airborne route.

https://www.cdc.gov/sars/clinical/respirators.html

The bathroom floor drains with dried-up U-traps provided a pathway through which residents came into contact with small droplets containing viruses from the contaminated sewage. These droplets entered the bathroom floor drain through negative pressure generated by exhaust fans when the bathroom was being used with the door closed. Water vapor generated during a shower, and the moist conditions of the bathroom, could also have facilitated the formation of water droplets. The likelihood of exposure was enhanced by the small dimensions of the bathroom units (about 3.5 square meters). Virus-contaminated droplets could readily have been deposited on floor mats, towels, toiletries and other bathroom equipment.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC539564/