Wearing the clothes of a person who has bad breath is not contagious, because bad breath is not a contagious disease. Fox odor is what we call stinky sweating in medicine, and this special odor is caused by the unsaturated fatty acids produced by the bacteria and some organic substances in the secretions of the sweat glands. If you use drugs to kill the bacteria can produce an insufficient amount of unsaturated fatty acids, the odor can disappear. Clinically, it has been found that most of such patients have a family history, so the sweat odor is related to genetic factors.