Microbial control theory distinguishes levels of antimicrobial action — sterilization (destruction of all microbial life, including endospores), disinfection (reduction of microbes on inanimate surfaces), antisepsis (reduction on living tissue), degerming, and sanitation — and separates cidal agents (which kill) from static agents (which only inhibit growth and reproduction). Microbial death under physical or chemical treatment follows a constant proportional (logarithmic) rate rather than a linear one, so kill time is a function of initial population size, and effectiveness is further governed by variables such as agent concentration and age, temperature, pH, organic matter, exposure time, and the intrinsic resistance of the target organism or structure. This body of theory sits within microbiology's study of microbial physiology and infection control, linking cell structure (endospores, waxy cell walls, cyst walls, gram-negative outer membranes, viral envelopes) to differential susceptibility and to the four general mechanisms by which antimicrobial agents damage cells: membrane disruption, protein denaturation, nucleic acid damage, and free-radical oxidation.
Microbial control theory distinguishes levels of antimicrobial action — sterilization (destruction of all microbial life, including endospores), disinfection (reduction of microbes on inanimate surfa…