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Paper towels more effective at removing viruses than hand dryers: Study

Written By : Dr. Kamal Kant Kohli Published On 2020-04-17T13:45:51+05:30  |  Updated On 17 April 2020 1:45 PM IST
Paper towels more effective at removing viruses than hand dryers: Study
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Researchers have found that using paper towels is substantially more effective than jet dryers for removing microbes when still contaminated hands are dried. The research will be presented at European Congress on Clinical Microbiology and Infectious Diseases (ECCMID)*.

According to the researchers, hand drying is important to minimise the spread of dangerous microbes - including the novel coronavirus - since failure to remove them increases transfer to environmental surfaces and increases the opportunities for transmission and spread.

In this study, the authors investigated whether there are differences in extent of virus transmission, according to hand drying method, beyond the toilet/washroom to the hospital environment.

Four volunteers simulated contamination of their hands/gloved hands using a bacteriophage (which is a virus that infects bacteria - and so is harmless to humans).

Their hands were not washed after contamination - this was to simulate poorly/inadequately washed hands.

Hands were dried using either paper towels (PT) or a jet air dryer (JAD). Each volunteer wore an apron, to enable measurement of body/clothing contamination during hand drying. Hand drying was performed in a hospital public toilet and, after exiting, samples were collected from public and ward areas.

Environmental/surface sites (n=11) were sampled following contact with hands or apron.

The sites samples were doors (both push- and pull-type doors), stairs handrails, lift buttons, chairs in public and ward areas, phones, buttons on access intercoms to wards, stethoscope tubing, stethoscope head piece and chest piece, the aprons themselves, and armchairs that had been indirectly in contact with the apron.

For the latter, volunteers were asked to cross their arms across their chest while using the apron, before resting on the arms of the chair.

The team found that both JAD and PT methods statistically significantly reduced virus contamination of hands (by ~100 and ~1000 virus units/μl, respectively, see a figure in full abstract). For 10 out of 11 surfaces, significantly greater environmental contamination was detected after JAD versus PT use.

All surfaces sampled following JAD use showed phage contamination, compared with only 6 surfaces after PT use.

Average surface contamination following hand contact was more than 10 times higher after JAD versus PT use (shown by a difference of 1.1 on the log scale: 4.1 vs 3.0 log10 copies/μl).

Viral dispersal to apron/clothing was 5-fold higher with JAD compared to PT (3.5 and 2.8 log10 copies/μl, respectively).

Phage transfer from apron to the armchairs via the crossed arms was detected only after JAD use (average 3.2 log10 copies/μl).

This suggests transference of microbes to environmental surfaces can occur directly from hands that remain contaminated after hand drying, but also indirectly from a person's body that has itself been contaminated during hand drying.

The authors conclude: "There are clear differences, according to hand drying method, in the residual microbial contamination of the subject's hands and body.

Crucially, these differences in contamination translate into significantly greater levels of microbe contamination after jet air drying versus paper towel use from hands and body beyond the toilet/washroom.

As public toilets are used by patients, visitors and staff, the hand drying method chosen has the potential to increase (using jet dryers) or reduce (using paper towels) pathogen transmission in hospital settings."

They also note their findings have particular importance since there has been a general migration from use of paper towels to hand dryers in many settings and areas of the world, especially within healthcare environments in the UK. Both UK NHS** and WHO hand washing guidelines recommend use of a paper towel to dry hands (and also using a paper towel to turn off the tap).

They conclude: "We believe that our results are relevant to the control of the novel coronavirus that is spreading at pace worldwide.

Paper towels should be the preferred way to dry hands after washing and so reduce the risk of virus contamination and spread."

for further references log on to:


European Congress on Clinical Microbiology and Infectious DiseasPaper towelshand dryersCovid 19coronavirusCOVID 19
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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