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Updated: Jul 17, 2025
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A Method to Test the Efficacy of Handwashing for the Removal of Emerging Infectious Pathogens
Published on: June 7, 2017
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Factors associated with hand washing effectiveness: an institution-based observational study
Chen Shi1,2, Margaret O'Donoghue1, Lin Yang3
1School of Nursing, The Hong Kong Polytechnic University, Hong Kong, China.
Antimicrobial Resistance and Infection Control
|August 30, 2023
Summary
Proper hand washing technique and duration are crucial for effective decontamination. Optimal hand washing time is 31 seconds, with each step ideally lasting 4-5 seconds for best results.
Area of Science:
- Infection Control
- Public Health
- Microbiology
Background:
- Hand washing effectiveness is critical for preventing infections.
- Few studies have examined how specific hand washing steps influence contaminant removal.
Purpose of the Study:
- To evaluate how performance and duration of hand washing steps affect effectiveness.
- To identify demographic factors influencing hand washing outcomes.
Main Methods:
- Collected 744 hand washing videos from 664 participants.
- Evaluated step performance and duration by infection control experts.
- Quantified residual fluorescent gel to determine effectiveness.
Main Results:
- Step 3 (rub between fingers) was often omitted; Step 4 (rub dorsum of fingers) was frequently incorrect.
- Correct performance of steps 4 and 7, and longer rinsing time, improved effectiveness.
- Optimal total hand washing time was 31 seconds (steps 1-7), with 4-5 seconds per step.
Conclusions:
- Hand washing step performance, duration, sex, and rinsing time impact decontamination.
- Adhering to optimal durations for all steps can enhance hygiene.
- Further research is needed to refine hand hygiene standards and compliance.
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