Absolutely every conceivable place that people congregate, some person, infected with something unpleasant, will exhale into your environment droplet nuclei carrying disease.  Such trace droplets are capable of remaining suspended in the air for some time and carried about on currents.  None of us need be reminded of how communicable infection is in all confined environments.  Simply, persons in proximity may inhale the aforementioned droplets, and in turn contract the disease. 

Hence, CWCA products as a first line of defense should be installed throughout buildings where a significant hazard of airborne infection may be deterred.  Such facilities would be nursing homes, assisted livings, clinics, hospitals, spas and your very own home.