Wearing a face covering does not lead to a false sense of security or make people less cautious about hand hygiene, experts have claimed.
Their comments, published in the journal BMJ Analysis, are based on an examination of the scientific evidence available on mask-wearing, in the context of respiratory virus infections.
The researchers say evidence is growing that face coverings can reduce the spread of SARS-CoV-2, the virus that causes COVID-19.
However, they acknowledge the studies they examined are yet to be peer-reviewed and, thus, should be treated with caution.
But the scientists add that based on the limited evidence available, face coverings do not make people care less about the other key measures that the public have been asked to follow to reduce the spread of coronavirus, such as good hand hygiene.
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Early in the pandemic, the World Health Organisation warned that covering the face could “create a false sense of security that can lead to neglecting other essential measures such as hand hygiene practices”, a type of behaviour that is based on a theory known as “risk compensation”.
But in June, they changed the guidance, advising people to wear masks in public areas, “in light of evolving evidence”.
Last week in England, wearing face coverings became mandatory in indoor spaces such as shops, shopping centres, banks, takeaway outlets, post offices, sandwich shops and supermarkets.
Dr James Rubin, from the King’s College London’s department of psychological medicine and the paper’s co-author, said: “Many public health bodies are coming to the conclusion that wearing a face covering might help reduce the spread of SARS-CoV-2, and the limited evidence available suggests their use doesn’t have a negative effect on hand hygiene.”
Risk compensation suggests that people adjust their behaviour according to the perceived level of risk, acting more cautiously where they sense greater risk and becoming less careful if they feel more protected.
Experts have wondered whether wearing a mask would make people less cautious about other coronavirus risk-reducing measures.
So, a team of researchers, led by Professor Dame Theresa Marteau at the University of Cambridge’s Behaviour and Health Research Unit, looked at 22 systematic reviews (which involves examining all available evidence on a topic), assessing the effect of wearing a mask on transmission of respiratory virus infections.
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According to the scientists, the results from six experimental studies indicated that wearing masks “does not reduce the frequency of hand-washing or hand-sanitising”, with two studies showing “self-reported rates of hand-washing were higher in the groups wearing masks”.
The team also found three observational studies that showed people tended to shy away from those wearing masks, which according to the researchers, implies “face coverings do not adversely affect physical distancing at least by those surrounding the wearer”.
However, the researchers acknowledged these studies were not designed to assess risk compensation or look at social distancing.
Commenting on the analysis, Dr Nilu Ahmed, a lecturer in social sciences at the University of Bristol, said the findings were encouraging, “showing people don’t compensate for wearing masks by reducing hand-washing, and in fact hand-washing may increase as a result of the new behaviour”.
She added: “It is hopeful that emphasising the importance of clean hands when putting on, and before and after removing the mask will help to codify these rules as we build face coverings into daily outdoor routines.”
But Robert Dingwall, a professor of sociology at Nottingham Trent University, described the research as a “narrow approach to the study of risk compensation”.
He said: “The authors do us all a service by bringing together a body of work in a convenient form. Merely piling up fragile evidence does not, though, necessarily make it any stronger.”
A recent study from @OxfordDemSci found cloth face coverings, even homemade masks made of the correct material, are effective in reducing the spread of Covid-19 – for the wearer and those around them:https://t.co/OByHnEWfBT
— University of Oxford (@UniofOxford) July 14, 2020
Dr Flavio Toxvaerd, who specialises in the economics of infectious diseases at University of Cambridge, said that “the study is interesting primarily for what it tells us about the effects of people’s mask wearing on their other protective behaviour. But it’s less clear what they tell us about the aggregate effects of widespread mask wearing in the population.
“At the centre of risk compensation theory is the idea that an intervention that reduces infection risk will make people less cautious, for example by socially distancing less. The problem with applying this theory to face masks is that masks do not per se provide much protection to the wearer of the mask.
“Mask wearing primarily protects others against infection from the wearer. If this is widely understood by people, we should not expect to see any decrease in additional protective measures such as hand-washing or social distancing by mask wearers.
“For these reasons, the most important question is not whether wearing a mask will make one less cautious, but rather whether widespread mask wearing by others will make one less cautious. The study does not provide firm evidence on this issue.”
How can I protect myself from the coronavirus when shopping?
You’ll have seen signs in your local supermarket advising you to keep two metres from others while moving around the store. This is key to reducing your chances of catching the virus while shopping.
The coronavirus SARS-CoV-2 is spread through respiratory droplets that leave our mouth and nose when we cough, sneeze, or sometimes even talk. The droplets sprayed out by an infected person will contain the virus, which could then enter your body via your mouth, nose or eyes (this is why you shouldn’t be touching your face).
Respiratory droplets don’t usually travel more than one metre, so by keeping two metres from others, you’ll reduce the likelihood of being in the firing line. To make it easier to keep your distance, try to shop during off-peak hours, choose a store that’s limiting the number of people who can be inside at any one time, and use self-checkout if you can.
Keeping your hands clean is the other main thing you can do. If possible, wipe the trolley or basket handles with a disinfectant wipe when you arrive at the store. When you get home, wash your hands or use hand sanitiser before and after unpacking your bags.
A US study found that the coronavirus can survive for up to 24 hours on cardboard, and up to three days on hard, shiny surfaces such as plastic, so wiping down your purchases with a disinfectant spray or a soapy cloth before you put them away is another good habit to get into.
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