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Related Experiment Video

Updated: Oct 22, 2025

Determining Viral Disinfection Efficacy of Hot Water Laundering
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Quantifying pathogen infection risks from household laundry practices.

Kelly A Reynolds1, Marc P Verhougstraete1, Kristina D Mena2

  • 1The Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ, USA.

Journal of Applied Microbiology
|August 31, 2021
PubMed
Summary

Household laundry practices significantly impact infection risk. Advanced detergents and hot water washing reduce pathogen risks, but hand hygiene during laundry is crucial for infection prevention.

Keywords:
QMRAcontaminated textileshygieneinfectionslaundrypathogensrisk reduction

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Area of Science:

  • Microbiology
  • Public Health
  • Risk Assessment

Background:

  • Contaminated laundry poses an infection risk, particularly in domestic settings.
  • Current laundry guidelines are primarily for healthcare, not home environments.
  • Quantitative microbial risk assessment (QMRA) can evaluate household practices.

Purpose of the Study:

  • To assess household laundry risks for common pathogens.
  • To evaluate the effectiveness of different laundry practices (detergents, temperatures, sanitizers) in reducing microbial load.
  • To provide evidence-based guidance for safer home laundering.

Main Methods:

  • Utilized quantitative microbial risk assessment (QMRA) with published data.
  • Modeled infection risks for respiratory and enteric pathogens.
  • Assessed risks against a 1.0 × 10⁻⁶ acceptable risk threshold.
  • Evaluated various laundry parameters: detergent type, water temperature, sanitizer use, and drying.

Main Results:

  • Cold water washes with standard detergents showed risks from 2.2 × 10⁻⁵ to 2.2 × 10⁻⁷ for respiratory pathogens.
  • Advanced enzymatic detergents reduced respiratory pathogen risks to 8.6 × 10⁻⁸ and 2.2 × 10⁻¹¹.
  • Enteric pathogens require hot water, advanced detergents, sanitizers, and drying to meet risk targets.
  • Hand hygiene at critical control points reduced infection risks by up to 6 log₁₀.

Conclusions:

  • Household laundry practices can be optimized to reduce infection risks.
  • Hot water, advanced detergents, and sanitizers are more effective for enteric pathogens.
  • Hand hygiene during laundry is the most critical factor in preventing infection transmission.
  • Study provides guidance for achieving targeted risk reductions in domestic laundering.