Thank you for that question and allowing me to clarify. People in and of themselves don't become resistant. It's somewhat of a metaphysical kind of question, because to some degree we're not only what we traditionally think of as ourselves but also the organisms that are in and on us. We each have our own bacterial fingerprint.
The person doesn't become resistant. It's the pathogens, that for many people don't cause any problems, that develop resistance and may be passed on from person to person, or animal to person, or the other way around. When those take hold and cause disease, that's when we have a clinical problem. People in and of themselves don't characteristically develop resistance; it's the bacteria, the pathogen, that can be transferred onward.