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At the time of writing, the World Health Organization (WHO) recommends that, outside of health professionals, people should only wear masks if they display symptoms of COVID-19 or are taking care of someone who does. However, more and more countries now recommend that people wear face masks in public places, and WHO is reconsidering its advice based on new evidence.
Prof Jonathan Van-Tam, England’s deputy chief medical officer and a specialist in epidemiology and pandemic preparedness, said in a briefing on 3 April: “…there is no evidence that general wearing of face masks by the public who are well affects the spread of the disease in our society. What matters right now, of course, is social distancing.”
CAN FACE MASKS STOP THE SPREAD OF COVID-19?
“The problem with the new coronavirus is that there’s too little information about exactly how it’s spread, because it’s so new,” says Dr Alexander Edwards, associate professor at the School of Pharmacy at the University of Reading. We don’t know if it’s spread more effectively through contact or coughs and sneezes, he adds.
It is not ethical to expose someone to COVID-19 to study the transmission. Instead, biologists have to make do with other methods. One study from MIT used high-speed cameras to track the droplets expelled in coughs and sneezes. They found that puffs of air carry droplets for up to six or eight metres, for coughs and sneezes respectively. Another study, conducted by aerosol specialist Dr Boris Gorbunov, found that taking wind conditions into account could bring the distance a cough travels up to 25 metres.
Denne historien er fra May 2020-utgaven av BBC Focus - Science & Technology.
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Denne historien er fra May 2020-utgaven av BBC Focus - Science & Technology.
Start din 7-dagers gratis prøveperiode på Magzter GOLD for å få tilgang til tusenvis av utvalgte premiumhistorier og 9000+ magasiner og aviser.
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WHEN'S THE BEST TIME FOR A CAFFEINE HIT?
Wakey-wakey! Find the sweet spot for a coffee shot and science says the benefits are grande
DEAD MAN’S FINGERS
Picture the scene. It's Halloween and you've gone for an ill-advised stroll through the graveyard on the edge of town.
What tipping point are climate scientists most worried about?
Collapsing ice sheets, loss of the Amazon rainforest, melting permafrost.……. Key parts of Earth's climate system are in trouble. Which could trigger disaster first?
PROFESSOR BRIAN COX
The biggest space missions yet are making their way to new parts of the Universe. In his new BBC Two series Solar System, Prof Brian Cox reveals what these explorations are discovering about life in our galactic neighbourhood. Noa Leach sat down with him to talk about the most exciting new missions, life in the Universe and his top behind-the-scenes moments of filming
KEEP YOUR HAIR ON
MORE THAN HALF OF MEN AND MILLIONS OF WOMEN ARE AFFECTED BY HAIR LOSS. IT CAUSES LOW SELF-ESTEEM IN SOME AND ANXIETY IN OTHERS. THANKFULLY, SCIENTISTS AROUND THE WORLD ARE GETTING TO THE ROOTS OF THE PROBLEM WITH PIONEERING NEW TREATMENTS
DAMAGE ASSESSMENT
Could we deflect an asteroid to stop it from hitting Earth? The success of NASA's DART mission suggests so, but only after ESA's soon-to-launch Hera mission has checked the results will we know if this approach to planetary defence is a viable possibility
SAVE THE SHARKS...SAVE THE OCEANS
RUTHLESS PREDATORS, MINDLESS KILLERS, MAN-EATERS... SHARKS HAVE A FEARSOME REPUTATION THAT BEARS LITTLE RELATION TO REALITY. THE TRUTH IS, THESE REMARKABLE CREATURES ARE STRUGGLING TO SURVIVE. BUT OUR WATERS WON'T BE ANY SAFER WITHOUT THEM. IN FACT, THE PLANET'S SEAS WILL BE IN EVEN GREATER JEOPARDY THAN THEY ALREADY ARE
COULD ARTIFICIAL INTELLIGENCE BE THE CURE FOR LONELINESS?
Rates of loneliness are increasing worldwide. But big-tech companies think they have the solution...
Olive mill wastewater: a health-boosting tonic hiding in the leftovers
A by-product of the olive oil production process is packed with compounds that lower your cholesterol and reduce your risk of developing cancer.
Lab-grown meat may be better for livestock, but not necessarily for the environment
The move to put alternative protein on our plates is gathering pace but there are still questions to answer
