Monday, April 24, 2023
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Wednesday, April 19, 2023
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Study shows antibiotic-resistant 'superbugs' are being passed between dogs and cats and their owners
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Why pandemic researchers are talking about raccoon dogs
It caught the attention of Florence Débarre, a researcher who works at CNRS, the French national research agency.
After quickly downloading the data, an international team of researchers from Europe, North America and Australia conducted an analysis and uncovered key details about how the SARS-CoV-2 pandemic may have began. They published their findings in a report this week.
Katherine J. Wu, science writer at The Atlantic, broke the story. She talks to Short Wave co-host Emily Kwong about this new analysis — the strongest evidence yet on the pandemic's natural origins — what questions remain and why the genetic material of raccoon dogs being found in the mix matters.
As a scientific endeavor, virus hunting takes years. Data transparency is paramount, and officials in China have been resistant to sharing information. The origins of the 2002-2004 SARS outbreak weren't known for a decade. You can listen to Emily's 2020 conversation with Dr. Lin-Fa Wang about this SARS outbreak — referenced in this episode — here.
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Dogs have an acute sense of smell. This could prove useful in the medical world, as researchers are finding that dogs can sniff out the markers of breast, colorectal, lung, and other types of cancer.
Humans have put dogs’ remarkable sense of smell to use by training them to sniff out explosives and narcotics. Their powerful noses can also detect viruses, bacteria, and signs of cancer in a person’s body or bodily fluids.
In this article, we look at the evidence behind dogs’ abilities to smell and identify different types of cancer, and how medical professionals can use dogs to help diagnose the condition.
Can dogs smell cancer?
Research suggests that dogs can detect many types of cancers in humans.
Like many other diseases, cancers leave specific traces, or odor signatures, in a person’s body and bodily secretions. Cancer cells, or healthy cells affected by cancer, produce and release these odor signatures. They detectTrusted Source these odors in substances called volatile organic compounds (VOCs).
Depending on the type of cancer, dogs are able to detect VOCs in a person’s:skin
Dogs can detect these odor signatures and, with training, alert people to their presence. People refer to dogs that undergo training to detect certain diseases as medical detection dogs.
Trained dogs can detect some substances in very low concentrations, as low as parts per trillion, which makes their noses sensitive enough to detect cancer markers in a person’s breath, urine, and blood.
Which types of cancer can a dog smell?
Research has shown that dogs can detect many types of cancer, such as:
For example, one case reportTrusted Source describes how a 75-year-old man visited a doctor after his dog licked persistently at a lesion behind the man’s ear.
The doctor performed diagnostic tests and confirmed malignant melanoma.
Nobody had trained this person’s dog specifically to detect cancer. However, most research studies into canine cancer detection involve teaching individual dogs to sniff out specific cancers.
Scientists have found evidence that some dogs can detect colorectal cancer from people’s breath and watery stool with high levels of accuracy, even for early-stage cancers. The presence of gut inflammation or noncancerous colorectal disease does not seem to affect dogs’ ability to detect these cancers.
Dogs may also detect lung cancer from a person’s breath. One studyTrusted Source found that a trained dog had a very high rate of accuracy in distinguishing between the breath of people with and without lung cancer.
In another studyTrusted Source, two dogs received training for 1 year. After this, researchers presented the dogs with a number of urine samples. The dogs proved 45–73% accurate in detecting lung cancer through the samples.
Dogs have also detectedTrusted Source ovarian cancer from blood samples and prostate cancer by sniffingTrusted Source a person’s urine.
In 2021, researchers reportedTrusted Source that a dog trained to detect signs of breast cancer in urine was able to detect breast cancer with 100% accuracy among urine samples from 200 people. Of these, 40 had breast cancer, 182 had other cancers, and 18 had no cancer. This study has yet to be repeated with a larger population of dogs to see if the outcomes can be reproduced.
One study found that dogs trained only to detect breast cancer were also able to detect melanoma and lung cancer. This suggests there may be a common odor signature across different types of cancer.
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A team of osteoarchaeologists, archaeologists and veterinarian scientists from Istanbul University-Cerrahpaşa, Atatürk University, University of Environmental and Life Sciences, ul. Kożuchowska, has found evidence of early Romans breeding dogs with flat faces. In their study, reported in Journal of Archaeological Science: Reports, the group examined the remains of a dog found in a tomb in what was once a city called Tralleis, in what is now modern Turkey.
The dog remains were found at a dig site in Aydın back in 2007, but were considered too delicate for study at the time—they were put in safe storage instead. In 2021, the team on this new effort retrieved the bones and began a slow study of the bones to learn more about the dog.
Though the specimen was not complete, the research team was still able to determine that it was a dog and that it had been treated well. Many dog remains have been found from Roman times, and because most were used as work animals, most were not well treated. The team identified the dog as a brachycephalic breed, a group that includes flat-faced dogs such as boxers, pugs and chow chows. The find was unique; only one other brachycephalic breed had ever been found before from a place in the Roman Empire, and that was in the ruins of Pompeii. It also marks the oldest known find of a brachycephalic anywhere, suggesting the Romans may have been the first to breed flat-faced dogs.
The research team was also able to deduce the dog's general size and found it to be smaller than they had expected. Carbon dating revealed it to be from between 1,942 and 2,118 years ago. Also, study of its teeth showed that it had barely made it to adulthood before dying. The team also compared the skull with several modern dog breeds and found it looked mostly like a French bulldog.
The researchers noted that the dog had been buried close to a human, who, they suggest, was likely its owner. This, they further suggest, indicates that the dog was likely killed and buried when its master died so that the two could be buried together.
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Invited Review: "Probiotic" approaches to improving dairy production: reassessing "magic foo-foo dust"
J Dairy Sci. 2023 Nov 8:S0022-0302(23)00790-7. doi: 10.3168/jds.2023-23831. Online ahead of print. ABSTRACT The gastrointestinal microbia...
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J Dairy Sci. 2023 Nov 8:S0022-0302(23)00790-7. doi: 10.3168/jds.2023-23831. Online ahead of print. ABSTRACT The gastrointestinal microbia...
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