Most efficient method for hand hygiene in clinical settings:

Correct answer: C. Alcohol-based hand rub (ABHR) — fastest and most effective against most organisms

• A. Chlorhexidine surgical scrub is for surgical hand preparation — not for routine hand hygiene.
• B. Plain soap and water is required for visible soiling and C. diff — but takes longer and is less broadly effective than ABHR.
• C. Correct. Per CDC guidelines, ALCOHOL-BASED HAND RUB (ABHR, ≥60% isopropyl or ethyl alcohol) is the most EFFICIENT method for hand hygiene in clinical settings. It: (1) requires no water/towels, (2) takes only 20–30 seconds, (3) is more effective against bacteria and most viruses than plain soap, (4) causes less skin irritation than repeated soap washing. Exception: wash with soap/water for visible soiling or C. difficile spores (alcohol doesn't kill spores).
• D. Antimicrobial soap is more effective than plain soap but slower than ABHR.