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Minimal influenza virus transmission from touching contaminated face masks: a laboratory study
Yuxuan Fan1,2,3, Hidekazu Nishimura4, Soichiro Sakata5
1Clinical Research Division, Virus Research Center, Sendai Medical Center, National Hospital Organization, 2-11-12 Miyagino, Miyagino, Sendai, 983-8520, Japan.
Abstract:
The risk of virus transmission via the touching of contaminated masks has long been assumed by infection control teams. Yet, robust evidence to support this belief has been lacking. This risk was investigated in a laboratory setting by measuring the amount of viable influenza virus successfully transferred from artificially contaminated medical (surgical) mask surfaces to a human finger used to swipe their outer surface under various experimental conditions. Despite being exposed to high levels of virus contamination on the masks, very little or no viable virus was successfully transferred from the mask to the finger in these experiments.
Insights
Touching contaminated masks rarely transmits influenza virus. Laboratory experiments show minimal viable virus transfer from surgical masks to fingers, challenging long-held infection control assumptions.
Area of Science:
- Virology
- Infection Control
- Public Health
Background:
- Infection control teams often assume virus transmission risk from touching contaminated masks.
- Robust scientific evidence supporting this assumption has been limited.
- Understanding surface-to-hand virus transfer is crucial for effective prevention strategies.
Purpose of the Study:
- To investigate the actual risk of viable influenza virus transmission from contaminated medical (surgical) masks to human fingers.
- To quantify virus transfer under controlled laboratory conditions.
- To provide empirical data on mask contamination and potential transmission routes.
Main Methods:
- Artificially contaminating medical (surgical) masks with influenza virus.
- Simulating finger swiping of the outer mask surface under various conditions.
- Measuring the amount of viable virus transferred from the mask to the finger.
Main Results:
- Very little or no viable influenza virus was successfully transferred from contaminated masks to fingers.
- Despite high initial virus contamination levels on masks, transfer efficiency was extremely low.
- Experimental conditions did not significantly increase viable virus transfer.
Conclusions:
- The risk of influenza virus transmission through direct touching of contaminated masks appears to be minimal.
- Current assumptions regarding mask-to-hand virus transmission may overestimate the actual risk.
- Findings suggest a need to re-evaluate infection control guidance related to mask handling.
