Australia has just suffered a severe flu season, with 299,211 laboratory-confirmed cases, at last count, and 662 deaths. This might be a sign of what’s to come for the UK and US as the virus spreads to the northern hemisphere.
Flu season in the UK runs from December to March, but can start as early as October, so finding ways to avoid catching the bug starts around now. The usual method is to get the flu jab. But the flu vaccine is usually only around 15 per cent effective, so people will be looking for a belt-and-braces approach to avoid getting infected.
The flu virus is mainly spread by droplets expelled from the mouths and noses of infected people when they cough, sneeze or talk. These droplets can spread up to six feet away.
It may seem intuitive that if you wear a surgical mask you could stop the virus from getting into your lungs. And certainly, that’s how most masks are marketed online. One flu surgical face mask even boasts: “Protect against the Deadly H1N1 swine flu that has killed many worldwide and other bacteria and viruses in the air.”
Surgical masks were first introduced in the operating theatre in the late 1800s, usually made out of two layers of gauze. The masks first found their public appeal during the Spanish flu outbreak of 1918 – an epidemic that killed around 50 million people.
The logic of wearing a surgical mask must surely be: if it works for surgeons, it must work for me. The problem is, the mask isn’t intended to protect the surgeon. It’s intended to stop droplets from the surgeon’s mouth or nose getting into the patient’s wound and causing sepsis. But despite their use for more than a century, their prophylactic effectiveness is in doubt. Indeed, a recent study showed that surgical masks can be a source of bacterial contamination in the operating theatre. Although they are designed to trap bacteria shed by the surgeon’s nose and mouth, the study found bacteria on the exterior of used masks.
1/20 Jackdaws can identify ‘dangerous’ humans
Jackdaws can identify “dangerous” humans from listening to each other’s warning calls, scientists say.
The highly social birds will also remember that person if they come near their nests again, according to researchers from the University of Exeter.
In the study, a person unknown to the wild jackdaws approached their nest. At the same time scientists played a recording of a warning call (threatening) or “contact calls” (non-threatening). The next time jackdaws saw this same person, the birds that had previously heard the warning call were defensive and returned to their nests more than twice as quickly on average.
Getty
2/20 Turtle embryos influence sex by shaking
The sex of the turtle is determined by the temperatures at which they are incubated. Warm temperatures favour females.
But by wiggling around the egg, embryos can find the “Goldilocks Zone” which means they are able to shield themselves against extreme thermal conditions and produce a balanced sex ratio, according to the new study published in Current Biology journal
Ye et al/Current Biology
3/20 Elephant poaching rates drop in Africa
African elephant poaching rates have dropped by 60 per cent in six years, an international study has found.
It is thought the decline could be associated with the ivory trade ban introduced in China in 2017.
Reuters
4/20 Ancient four-legged whale discovered in Peru
Scientists have identified a four-legged creature with webbed feet to be an ancestor of the whale. Fossils unearthed in Peru have led scientists to conclude that the enormous creatures that traverse the planet’s oceans today are descended from small hoofed ancestors that lived in south Asia 50 million years ago
A. Gennari
5/20 Animal with transient anus discovered
A scientist has stumbled upon a creature with a “transient anus” that appears only when it is needed, before vanishing completely. Dr Sidney Tamm of the Marine Biological Laboratory could not initially find any trace of an anus on the species. However, as the animal gets full, a pore opens up to dispose of waste
Steven G Johnson
6/20 Giant bee spotted
Feared extinct, the Wallace’s Giant bee has been spotted for the first time in nearly 40 years. An international team of conservationists spotted the bee, that is four times the size of a typical honeybee, on an expedition to a group of Indonesian Islands
Clay Bolt
7/20 New mammal species found inside crocodile
Fossilised bones digested by crocodiles have revealed the existence of three new mammal species that roamed the Cayman Islands 300 years ago. The bones belonged to two large rodent species and a small shrew-like animal
New Mexico Museum of Natural History
8/20 Fabric that changes according to temperature created
Scientists at the University of Maryland have created a fabric that adapts to heat, expanding to allow more heat to escape the body when warm and compacting to retain more heat when cold
Faye Levine, University of Maryland
9/20 Baby mice tears could be used in pest control
A study from the University of Tokyo has found that the tears of baby mice cause female mice to be less interested in the sexual advances of males
Getty
10/20 Final warning to limit “climate catastrophe”
The Intergovernmental Panel on Climate Change has issued a report which projects the impact of a rise in global temperatures of 1.5 degrees Celsius and warns against a higher increase
Getty
11/20 Nobel prize for evolution chemists
The nobel prize for chemistry has been awarded to three chemists working with evolution. Frances Smith is being awarded the prize for her work on directing the evolution of enzymes, while Gregory Winter and George Smith take the prize for their work on phage display of peptides and antibodies
Getty/AFP
12/20 Nobel prize for laser physicists
The nobel prize for physics has been awarded to three physicists working with lasers. Arthur Ashkin (L) was awarded for his “optical tweezers” which use lasers to grab particles, atoms, viruses and other living cells. Donna Strickland and Gérard Mourou were jointly awarded the prize for developing chirped-pulse amplification of lasers
Reuters/AP
13/20 Discovery of a new species of dinosaur
The Ledumahadi Mafube roamed around 200 million years ago in what is now South Africa. Recently discovered by a team of international scientists, it was the largest land animal of its time, weighing 12 tons and standing at 13 feet. In Sesotho, the South African language of the region in which the dinosaur was discovered, its name means “a giant thunderclap at dawn”
Viktor Radermacher / SWNS
14/20 Birth of a planet
Scientists have witnessed the birth of a planet for the first time ever.
This spectacular image from the SPHERE instrument on ESO’s Very Large Telescope is the first clear image of a planet caught in the very act of formation around the dwarf star PDS 70. The planet stands clearly out, visible as a bright point to the right of the center of the image, which is blacked out by the coronagraph mask used to block the blinding light of the central star.
ESO/A. Müller et al
15/20 New human organ discovered that was previously missed by scientists
Layers long thought to be dense, connective tissue are actually a series of fluid-filled compartments researchers have termed the “interstitium”.
These compartments are found beneath the skin, as well as lining the gut, lungs, blood vessels and muscles, and join together to form a network supported by a mesh of strong, flexible proteins
Getty
16/20 Previously unknown society lived in Amazon rainforest before Europeans arrived, say archaeologists
Working in the Brazilian state of Mato Grosso, a team led by archaeologists at the University of Exeter unearthed hundreds of villages hidden in the depths of the rainforest.
These excavations included evidence of fortifications and mysterious earthworks called geoglyphs
José Iriarte
17/20 One in 10 people have traces of cocaine or heroin on fingerprints, study finds
More than one in 10 people were found to have traces of class A drugs on their fingers by scientists developing a new fingerprint-based drug test.
Using sensitive analysis of the chemical composition of sweat, researchers were able to tell the difference between those who had been directly exposed to heroin and cocaine, and those who had encountered it indirectly.
Getty
18/20 Nasa releases stunning images of Jupiter’s great red spot
The storm bigger than the Earth, has been swhirling for 350 years. The image’s colours have been enhanced after it was sent back to Earth.
Pictures by: Tom Momary
19/20 A 3D reconstruction of an African grey parrot post euthanasia
Included in Wellcome Image Awards, this 3D image of an African grey parrot shows the highly intricate system of blood vessels.
Scott Birch. Wellcome Images
20/20 Baby Hawaiian bobtail squid
Another Wellcome Images Award winner, this time of baby Hawaiian bobtail squid. The black ink sac and light organ in the centre of the squid’s mantle cavity can be clearly seen.
Macroscopic Solutions. Wellcome Images
1/20 Jackdaws can identify ‘dangerous’ humans
Jackdaws can identify “dangerous” humans from listening to each other’s warning calls, scientists say.
The highly social birds will also remember that person if they come near their nests again, according to researchers from the University of Exeter.
In the study, a person unknown to the wild jackdaws approached their nest. At the same time scientists played a recording of a warning call (threatening) or “contact calls” (non-threatening). The next time jackdaws saw this same person, the birds that had previously heard the warning call were defensive and returned to their nests more than twice as quickly on average.
Getty
2/20 Turtle embryos influence sex by shaking
The sex of the turtle is determined by the temperatures at which they are incubated. Warm temperatures favour females.
But by wiggling around the egg, embryos can find the “Goldilocks Zone” which means they are able to shield themselves against extreme thermal conditions and produce a balanced sex ratio, according to the new study published in Current Biology journal
Ye et al/Current Biology
3/20 Elephant poaching rates drop in Africa
African elephant poaching rates have dropped by 60 per cent in six years, an international study has found.
It is thought the decline could be associated with the ivory trade ban introduced in China in 2017.
Reuters
4/20 Ancient four-legged whale discovered in Peru
Scientists have identified a four-legged creature with webbed feet to be an ancestor of the whale. Fossils unearthed in Peru have led scientists to conclude that the enormous creatures that traverse the planet’s oceans today are descended from small hoofed ancestors that lived in south Asia 50 million years ago
A. Gennari
5/20 Animal with transient anus discovered
A scientist has stumbled upon a creature with a “transient anus” that appears only when it is needed, before vanishing completely. Dr Sidney Tamm of the Marine Biological Laboratory could not initially find any trace of an anus on the species. However, as the animal gets full, a pore opens up to dispose of waste
Steven G Johnson
6/20 Giant bee spotted
Feared extinct, the Wallace’s Giant bee has been spotted for the first time in nearly 40 years. An international team of conservationists spotted the bee, that is four times the size of a typical honeybee, on an expedition to a group of Indonesian Islands
Clay Bolt
7/20 New mammal species found inside crocodile
Fossilised bones digested by crocodiles have revealed the existence of three new mammal species that roamed the Cayman Islands 300 years ago. The bones belonged to two large rodent species and a small shrew-like animal
New Mexico Museum of Natural History
8/20 Fabric that changes according to temperature created
Scientists at the University of Maryland have created a fabric that adapts to heat, expanding to allow more heat to escape the body when warm and compacting to retain more heat when cold
Faye Levine, University of Maryland
9/20 Baby mice tears could be used in pest control
A study from the University of Tokyo has found that the tears of baby mice cause female mice to be less interested in the sexual advances of males
Getty
10/20 Final warning to limit “climate catastrophe”
The Intergovernmental Panel on Climate Change has issued a report which projects the impact of a rise in global temperatures of 1.5 degrees Celsius and warns against a higher increase
Getty
11/20 Nobel prize for evolution chemists
The nobel prize for chemistry has been awarded to three chemists working with evolution. Frances Smith is being awarded the prize for her work on directing the evolution of enzymes, while Gregory Winter and George Smith take the prize for their work on phage display of peptides and antibodies
Getty/AFP
12/20 Nobel prize for laser physicists
The nobel prize for physics has been awarded to three physicists working with lasers. Arthur Ashkin (L) was awarded for his “optical tweezers” which use lasers to grab particles, atoms, viruses and other living cells. Donna Strickland and Gérard Mourou were jointly awarded the prize for developing chirped-pulse amplification of lasers
Reuters/AP
13/20 Discovery of a new species of dinosaur
The Ledumahadi Mafube roamed around 200 million years ago in what is now South Africa. Recently discovered by a team of international scientists, it was the largest land animal of its time, weighing 12 tons and standing at 13 feet. In Sesotho, the South African language of the region in which the dinosaur was discovered, its name means “a giant thunderclap at dawn”
Viktor Radermacher / SWNS
14/20 Birth of a planet
Scientists have witnessed the birth of a planet for the first time ever.
This spectacular image from the SPHERE instrument on ESO’s Very Large Telescope is the first clear image of a planet caught in the very act of formation around the dwarf star PDS 70. The planet stands clearly out, visible as a bright point to the right of the center of the image, which is blacked out by the coronagraph mask used to block the blinding light of the central star.
ESO/A. Müller et al
15/20 New human organ discovered that was previously missed by scientists
Layers long thought to be dense, connective tissue are actually a series of fluid-filled compartments researchers have termed the “interstitium”.
These compartments are found beneath the skin, as well as lining the gut, lungs, blood vessels and muscles, and join together to form a network supported by a mesh of strong, flexible proteins
Getty
16/20 Previously unknown society lived in Amazon rainforest before Europeans arrived, say archaeologists
Working in the Brazilian state of Mato Grosso, a team led by archaeologists at the University of Exeter unearthed hundreds of villages hidden in the depths of the rainforest.
These excavations included evidence of fortifications and mysterious earthworks called geoglyphs
José Iriarte
17/20 One in 10 people have traces of cocaine or heroin on fingerprints, study finds
More than one in 10 people were found to have traces of class A drugs on their fingers by scientists developing a new fingerprint-based drug test.
Using sensitive analysis of the chemical composition of sweat, researchers were able to tell the difference between those who had been directly exposed to heroin and cocaine, and those who had encountered it indirectly.
Getty
18/20 Nasa releases stunning images of Jupiter’s great red spot
The storm bigger than the Earth, has been swhirling for 350 years. The image’s colours have been enhanced after it was sent back to Earth.
Pictures by: Tom Momary
19/20 A 3D reconstruction of an African grey parrot post euthanasia
Included in Wellcome Image Awards, this 3D image of an African grey parrot shows the highly intricate system of blood vessels.
Scott Birch. Wellcome Images
20/20 Baby Hawaiian bobtail squid
Another Wellcome Images Award winner, this time of baby Hawaiian bobtail squid. The black ink sac and light organ in the centre of the squid’s mantle cavity can be clearly seen.
Macroscopic Solutions. Wellcome Images
Impractical
Surgical masks are sometimes referred to as courtesy masks, suggesting that some people wear them for the same altruistic reason surgeons wear them: to stop others getting their germs. But as the studies in operating theatres show, this benefit is dubious. And given that many people describe the flu as like being hit by a truck, it is unlikely that people will be strolling around town with a mask on when they’re at their most infectious – three to four days after symptoms begin. They’ll be tucked up in bed, sweating and aching.
One way masks could stop you getting the flu is by stopping your hand touching your mouth or nose. Aside from inhaling droplets, you can also get the flu from touching anything with the flu virus on it – the armrests on public transport, say – and then touching your face. And people touch their faces a lot without even realising it. A study from New South Wales found that people touch their faces roughly 23 times an hour.
There’s one weak point in this plan: you can also get the flu from touching your eye with your contaminated hand. And even to stop the hand to mouth/nose transmission, you’d have to wear a mask 24/7, regularly disposing of the old ones while trying to avoid touching your face. And wearing masks can feel unpleasant and make communication difficult. So they’re not very practical. One study found that only 21 per cent of people are able to keep masks on for the recommended time.
No strong evidence
A study that is often cited as evidence that surgical masks work is a randomised trial from 2009 that compared surgical masks with a specialist mask called an N95 respirator – a mask that fits snugly and filters at least 95 per cent of very small (0.3 micron) particles.
The study, published in Jama, found that surgical masks were as effective as N95 respirators at preventing the flu, which is to say, not all that effective. Of the 446 nurses who took part in this study, nearly one in four (24 per cent) in the surgical mask group still got the flu, as did 23 per cent of those who wore the N95 respirator. And, because both groups wore masks, it’s impossible to say how they would have fared compared with not wearing a mask at all.
Basically, there is no strong evidence to support people wearing surgical masks in public. Or as the US Centers for Disease Control and Prevention put it: “No recommendation can be made at this time for mask use in the community by asymptomatic persons, including those at high risk for complications, to prevent exposure to influenza viruses.”
The best thing you can do to stop getting the flu is to regularly wash your hands, and try to avoid touching your face.
Manal Mohammed is a lecturer in medical microbiology at the University of Westminster. This article first appeared on The Conversation
