Why is microbial control necessary and what are some of the factors that go into the choice of a particular antimicrobial agent?

Why is microbial control necessary and what are some of the factors that go into the choice of a particular antimicrobial agent?
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The control of microorganisms is an important way of preventing pathogens from reaching the body.Sterilizing laboratory equipment, hospital supplies, and industrial apparatus helps contain contamination.The choice of a particular antimicrobial agent depends on such things as the kind of material to be treated(living or nonliving), the kind of croorganism to be controlled, the environmental conditions existing at the time of the agent’s use (for example, the temperature of the environment and concentration of microorganisms), the acidity or alkalinity of the area, and the presence of organic matter. 
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