Despite how COVID 19 scared everyone, through the pandemic I have seen the method of transmission you mentioned so many times. Despite being proper signage and being told, people think it wont matter to disregard PPE for a moment, and that’s all it takes. One uncontrolled cough. Masks, especially N95’s, can be very muting, and as you mentioned, there is an urge to remove it for someone you can’t hear all that well. Whoever that visitor is, will now carry that out of the infected persons room, into the rest of the facility and community, not knowing they are spreading it.