Which term refers to antimicrobial action that continues after the solution has dried?

Which term refers to antimicrobial action that continues after the solution has dried?

• A. Residual activity
• B. Two-stage prep
• C. Paint prep
• D. Alcohol

Answer: (A)

The key idea is residual activity, the lasting antimicrobial effect after the prep has dried. Some antiseptics, like chlorhexidine, bind to the outer layer of skin (keratin) and are released slowly over time, continuing to kill or inhibit microbes even after the solution dries. This sustained action is known as substantivity or residual activity and is why certain preps provide ongoing protection during the early postoperative period. Alcohol-based preparations act quickly but evaporate, leaving little to no prolonged antimicrobial effect once dried. Two-stage prep describes a procedure or sequence of steps in applying antiseptics, not the lasting action of the agent itself. Paint prep refers to a film-forming approach, which is a technique rather than the inherent duration of antimicrobial activity after drying. So the term that best describes antimicrobial action continuing after the solution has dried is residual activity.

The key idea is residual activity, the lasting antimicrobial effect after the prep has dried. Some antiseptics, like chlorhexidine, bind to the outer layer of skin (keratin) and are released slowly over time, continuing to kill or inhibit microbes even after the solution dries. This sustained action is known as substantivity or residual activity and is why certain preps provide ongoing protection during the early postoperative period.

Alcohol-based preparations act quickly but evaporate, leaving little to no prolonged antimicrobial effect once dried. Two-stage prep describes a procedure or sequence of steps in applying antiseptics, not the lasting action of the agent itself. Paint prep refers to a film-forming approach, which is a technique rather than the inherent duration of antimicrobial activity after drying.

So the term that best describes antimicrobial action continuing after the solution has dried is residual activity.