Is there anyone else out there who has anxiety over people visiting who are sick?

The reason I ask- one of my best friends wants to come to the hospital to see the baby after she is born and she also is the type to not stay away if she is sick or someone in her family has been sick. Needless to say, her son had MRSA right now and I am totally freaking out. I don’t know whether I am being paranoid or am I right to tell her not to visit?