she has already been in contact with that patient before his outbreak, so if she did get infected then she already brought it into the house/cars etc.. boil all of your sheets, towels, disinfect the bathroom, and clean the carpets, furniture etc. scabies is treatable although it is a bitch if you have it. dont worry because the damage is done now. chances are she did not contract it. i work in the medical field and we wear gloves and take other precautions to protect ourselves from these things, but the chance is already there. scabies is like chicken pox, you are contagious before the outbreak and also during the outbreak, same thing with pink eye.
you and your wife should be just fine.