Which step in hand washing technique is MOST critical for effective reduction of microorganism transmission?

HAND HYGIENE is the single most effective intervention to prevent healthcare-associated infections (HAIs). The 5 MOMENTS FOR HAND HYGIENE (WHO standard): BEFORE touching a patient; BEFORE a clean/aseptic procedure; AFTER body fluid exposure risk; AFTER touching a patient; AFTER touching the patient's surroundings. CORRECT HANDWASHING TECHNIQUE: (1) Wet hands with water (temperature doesn't matter — warm is comfortable, hot doesn't kill more organisms); (2) Apply soap; (3) Lather and SCRUB for at least 20 seconds — the 20-second minimum is what the CDC recommends; many people scrub for only 6-10 seconds; count by singing 'Happy Birthday' twice; (4) Cover ALL surfaces: palms (laced together), backs of hands, between fingers, thumbs (often missed — circular motion around each thumb), fingertips and under nails (fingertip scrubbing against opposite palm), wrists; (5) Rinse thoroughly under running water; (6) Dry with a single-use paper towel; (7) Use the paper towel to turn off the faucet to avoid recontamination. ALCOHOL-BASED HAND RUB (ABHR): Preferred for most routine patient contacts (faster, less skin damage, more compliance); 3 mL rubbed until dry; same coverage of all surfaces required; NOT appropriate for C. difficile (spores are not killed by alcohol — must use soap and water for C. diff patients). NAILS: Natural nails should be kept short (less than 1/4 inch); artificial nails are prohibited in most clinical settings because they harbor organisms; nail polish that is chipped or cracked is also prohibited.