Inanimate items that may harbor microbes and aid in their transmission are called fomites . The level of cleanliness required for a fomite depends both on the item’s use and the infectious agent with which the item may be contaminated

The CDC and the NIH have established four biological safety levels (BSLs) for laboratories performing research on infectious agents. Each level is designed to protect laboratory personnel and the community.

Be able to compare disinfectants, antiseptics, and sterilants; describe the principles of controlling the presence of microorganisms through sterilization and disinfection; name at least two factors that can compromise the effectiveness of a disinfecting agent.