1. Any procedure that reduces to a significant degree the microbial flora of skin or mucous membranes: Sarah uses a hand sanitizer as an autoantisepsis after she has been riding the subway as a way to control any infectious bacteria that she may have come in contact with.
2. The prevention of a severe illness caused by an overwhelming poisoning of the bloodstream by toxin-producing bacteria: Mark takes his vitamins on a daily basis to support his natural autoantisepsis which helps him to stay healthy.