Results indicated that not only can dogs detect Covid faster, but they can also do so in a non-intrusive manner – so no need to swab your throat or nose
Dogs can detect Covid-19 faster and more accurately than a PCR test, a new study shows.
Researchers looked at the ability of canines to recognise the virus and its variants, even when they are obscured by other viruses, like those from common colds and flu.
More than 400 scientists from over 30 countries contributed to the study as well as 147 scent dogs, according to the findings published in the Journal of Osteopathic Medicine.
After analysing many studies covering both field and clinical experiments, Professor Dickey and Junqueira found that dogs who are trained to sniff out scents are “as effective and often more effective” than antigen tests.
A total of 53 dogs were trained to sniff out Covid scents, while 37 were not and scientists found that the dogs that were not trained were in some cases “slightly superior” to those that were pre-trained.
“The previously untrained dogs have the advantage that they are not as prone to indicating on scents other than the Covid–19 associated scent,” the paper said.
The results indicated that not only can dogs detect Covid faster, but they can also do so in a non-intrusive manner. This means you won’t need to put a swab in your throat or nose.
How can dogs detect the virus?
This essentially comes down to the dog’s highly evolved nose with its ability to sense out smells quicker.
Dogs possess up to 300 million olfactory receptors in their noses, compared to about six million in humans. And the part of a dog’s brain that is devoted to analysing smells is about “40 times greater” than humans. Canines also have ‘neophilia’, which means they are attracted to new and interesting odours
And so, with all these enhancements, dogs can detect very low concentrations of odours associated with Covid infections.
“They can detect the equivalent of one drop of an odorous substance in 10.5 Olympic-sized swimming pools,” Professor Dickey said. “For perspective, this is about three orders of magnitude better than with scientific instrumentation.”
Scientists also found that in some cases, the animals were also able to detect the virus in pre-symptomatic and asymptomatic patients, “whose viral load was too low for conventional tests to work.”
Professor Dickey has said that dogs can also differentiate Covid and its different variants in the presence of other respiratory viruses. This included the common cold or flu.
“They’re much more effective. In fact, one of the authors that we quote in the paper commented that the RT-PCR test is not the gold standard anymore. It’s the dog. And they’re so quick,” he added. “They can give you the yes or no within seconds if they’re directly smelling you.”
How was the study conducted to see if dogs can really detect Covid-19?
In some studies, the dogs gave a person a quick sniff, sitting down to see if the person has Covid. In another study, the dog was given a sweat sample to smell for a few minutes.
The press release has said that scent dogs, such as beagles, basset hounds and coonhounds are the ideal candidates for sniffing out the virus, given their “natural tendencies to rely on odours to relate to the world.”
But the studies which the researchers analysed showed a variety of dogs were up for the challenge and were able to sniff out the Covid odour. With a few weeks of training, puppies, older dogs, purebred and mixed breeds, both male and female were able to sniff such odours out and “all performed admirably,” the Eureka Alert press release said.
Although there has been success with dogs detecting such viruses, researchers believe there are still many challenges with using dogs for medical diagnoses.
“There’s quite a bit of research, but it’s still considered by many as a kind of a curiosity,” said Professor Dickey.
In conclusion, Professor Dickey and Junqueira said after reviewing the studies, believe that scent dogs deserve “their place as a serious diagnostic methodology that could be particularly useful during future pandemics, potentially as part of rapid routine health screenings in public spaces.”
“Perhaps, most importantly, we argue that the impressive international quality and quantity of COVID scent dog research described in our paper for the first time, demonstrates that medical scent dogs are finally ready for a host of mainstream medical applications,” they added.
9 Differences Between Men and Women That Have an Unexpected Explanation
Today, we would like to talk about the differences between men and women. You might say that you’ve known about these differences for your entire life, but it’s not that simple. We are sure that we’ll be able to highlight a few facts you’ve never heard of before. And in the bonus section, you’ll find out where the fashion for high heels came from.
The length of fingers
Let’s conduct a short experiment. Place your hand on a flat surface and compare the length of your index and ring fingers. In general, in women, the index finger is longer. In men, the ring finger is longer. How can this be explained?
According to scientists, the length of these fingers depends on the level of male and female hormones that affect the fetus in the womb. So, the reason why the ring finger is longer than the index finger in men is testosterone.
The skin on the heels
Scientists have found out that women’s skin is more hydrated in the décolleté area and on the hands. Only the skin on their heels is dryer than that of men. So, in equal conditions, men’s heels will be smoother.
Breast
You might think, “Why would a man need nipples?” It might sound strange but every person was initially female. When an embryo begins to develop in the womb, the male Y chromosome doesn’t immediately start working.
During the first 5-6 weeks, development occurs only under the influence of the X chromosome, so the nipples have enough time to form. If the embryo is male, the Y chromosome “turns on” after this period of time, and a boy is formed.
Men can even produce milk. Lactation is activated under special conditions, for example, it may appear during treatment with the hormone prolactin.
Vision
Women are better at seeing colors, but men are good at tracking fast-moving objects. This is probably linked to our hunter-gatherer past when men were hunters and women were gatherers.
For example, an orange may appear redder to a man than to a woman. The grass is almost always greener for women because green objects appear more yellow to men.
Gaining muscle mass
Many women have to go to the gym regularly to have a toned body, while a man can just lift a barbell a couple of times to get a 6 pack. So, what is the “ingredient” responsible for muscle development? If you guessed testosterone, you’re right.
In women, it is also produced, but in much smaller quantities. So, it is easier and faster for men to gain muscle mass.
Hair loss
Going bald after the age of 50 is typical for around half of men (and for a quarter of women too). The reason for this is a widespread hereditary disease, androgenetic alopecia, which is also called “male pattern baldness.” Due to this condition, hair follicles shrink, and hair becomes thinner and shorter, and eventually disappears.
Follicle shrinkage can be caused by sensitivity to dihydrotestosterone, a by-product of testosterone. This means that the more muscle-building hormone a man has, the more likely it is that he will become bald.
Adam’s apple
Both men and women have an Adam’s apple, but it’s more prominent in men. Why? The Adam’s apple is the cartilage that protects our vocal cords. It is formed during puberty. Since adult men have larger vocal cords, their Adam’s apple is also more prominent.
By the way, the larger the Adam’s apple, the deeper the voice. There is a theory that our ancestors needed a low voice in order to scare away predators.
Brain size
A man’s brain is larger than that of a woman, but this doesn’t mean that men are intellectually superior to women. Also, some parts of the brain in both sexes are different in size and work differently. For example, the hippocampus, which is involved in learning and creating memories, is larger in women. And the amygdala, which is associated with experiencing emotions and remembering them, is larger in men.
Scientists conducted an experiment: they showed the subjects a video so that they could recall some personal experiences. It turned out that in men, activity was observed only in the right amygdala, and in women, only in the left one.
Beard
At first glance, it might seem that a beard doesn’t provide any benefits. So, why does it grow? There is a theory that the jawline looks more massive thanks to a beard, so its wearer looks stronger and more masculine. Perhaps, our female ancestors tended to choose men with a thick beard as their partners because they thought they would produce healthy offspring with them.
Bonus: Heels
Nowadays, high heels are one of the symbols of femininity, aren’t they? However, in the 17th century, Persian riders used to wear one-inch heels. And since owning horses was a symbol of wealth, heeled shoes also came to signify money and power. The Persians then brought their fashion to Europe.
The French king Louis XIV became a big fan of heels. He even issued a decree according to which only nobles were allowed to wear heels. The higher and redder the heel was, the more powerful the wearer was.
The Sun King only allowed those who he favored the most to wear red heels. But since the 18th century, heels have become a purely feminine attribute, although this didn’t stop rock stars like David Bowie and The Beatles from wearing them.
Which facts mentioned in this article were new to you? Tell us in the comments below.
Preview photo credit 16704029 / Pixabay
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