If you put a corn chip in guacamole, take a bite, then dunk the chip in the bowl again, you're doing what's known as double-dipping. Scientists say it transfers about 2,750 bacteria from your mouth to the guacamole.
I advise against that kind of behavior in the coming week, and I suggest that you protect yourself against others who might engage in it. This is one time when you should be a purity freak. Meticulous attention to both physical and mental hygiene will be wise. Please protect yourself from germs of both the literal and psychic variety.