Ok, I worked in a hospital for about 4 years, and now I work for a chiropractor. He's the only one in his office, but luckily he never gets sick. This year however, he came in and worked sick, but I'm not sure anyone could really tell, like you can with congestion. Keep in mind that congestion isn't always contagious. We've all been sick in the office, but with sinus infections, etc. that can't be spread from person to person. We also take great care to cover our mouths and noses when coughing and sneezing, as well as frequent handwashing. A couple of my coworkers have come in when they were sick with more than that, however, mainly because they didn't want to leave us in a crunch without enough help. It's a tough spot, because patients come no matter whether we're sick or not, same with the hospital.