DOCTORS HAVE lounges AND THEY WALK IN AND LEAVE WITH THE SAME STREET CLOTHES THEY HAD ON WHEN THEY CAME IN.
If you go to visit someone in the hospital, you are carrying all kinds of things on your person when you leave, no matter what. No one should ever do anything but go straight home and shower after visiting or working in a hospital...period.
That said, some of those you see in public in their scrubs are not healthcare professionals...anyone can buy scrubs at Sam's Club. But I do know that some people who work in Nursing Homes especially, who have a careless attitude.
Anyone entering or leaving should really go through a decontamination procedure. The facilities improvements and employee training costs a lot of money. If it were up to me, I would virtually end public access to certain hospital areas. It is not a pretty picture, but what you cannot see will kill you.
It is bad enough so many people were too lazy or too stupid to finish their antibiotic prescriptions which lead to a lot of the multidrug-resistent organisms, now many will be too lazy or too cheap to assist in the effort to contain them.