ATI TEAS (Test of Essential Academic Skills) Version 7ReadingMedium
A patient asks a nurse, 'Why is it important to wash my hands thoroughly with soap and water for at least 20 seconds?' The nurse explains that this duration is necessary to effectively remove transient microorganisms and disrupt the integrity of pathogens, such as viruses and bacteria. What is the primary scientific rationale for the 20-second duration?
- ATo activate the antimicrobial properties of the soap.
- BTo give enough time for the mechanical action and chemical agents to work.
- CTo allow the soap to penetrate the skin completely.
- DTo ensure sufficient friction to dislodge germs.
Show answer & explanationAnswer & explanation
Correct answer: B. To give enough time for the mechanical action and chemical agents to work.
The 20-second duration for handwashing is a recommendation based on scientific evidence demonstrating that this time frame allows for the combined effect of mechanical friction (scrubbing), the emulsifying properties of soap, and the rinsing action of water to effectively dislodge, inactivate, and remove a significant number of transient microorganisms and disrupt pathogen structures.
Why the other options are wrong
- A. Most soaps are not antimicrobial in the sense of actively killing germs over time like an antiseptic; they primarily work by mechanical removal and emulsification. The 20 seconds is for the combined effect.
- C. Soap does not 'penetrate' the skin in a way that requires 20 seconds; its action is on the surface.
- D. While friction is crucial, 20 seconds accounts for both friction and the chemical action of soap, not just friction alone.
Rationale for 20-Second Handwashing
The scientific reason why handwashing with soap and water should last at least 20 seconds: to allow for the effective mechanical and chemical removal of pathogens.
- Combines friction (mechanical) and soap (chemical) action.
- Sufficient time to dislodge and inactivate germs.
- Removes transient microorganisms effectively.
Memory trick: TIME + SCRUB = CLEAN