Health
Potentially fatal dog parasite found in part of Colorado River for first time, having spread from other states
A parasite that can potentially kill dogs has been discovered for the first time in the Colorado River in Southern California, a study from University of California, Riverside said.
The parasite is called Heterobilharzia americana, which is a flatworm more commonly known as a liver fluke.
It had previously mainly been found in Texas and other Gulf states, has now spread west.
“Dogs can die from this infection, so we are hoping to raise public awareness that it’s there,” UC Riverside nematology professor Adler Dillman told the UC Riverside News. “If you’re swimming in the Colorado River with them, your pets are in peril.”
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A parasite that can potentially kill dogs has been discovered for the first time in the Colorado River in Southern California, a study from University of California, Riverside said. (Mark Runnacles/Getty Images)
Researchers with the school headed to Blythe, California, on the border with Arizona, and collected and tested 2,000 snails on the banks of the Colorado River there after finding out several dogs infected by the parasite had all swum there.
The study said their findings suggest “a wider distribution [of the parasite] than previously reported. Our findings have implications for public health, veterinary medicine, and biodiversity conservation, contributing to developing effective control strategies to prevent the spread of this emerging infectious disease.”
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“In our study, we successfully confirmed the presence of Heterobilharzia americana for the first time along the shores of the Colorado River, infecting two species of snails, Galba humilis and Galba cubensis,” the study authors said. “This significant finding marks the westernmost record of this endemic North American schistosome in the U.S. The identification of the parasite in an area with a documented history of canine schistosomiasis emphasizes the persistence and potential expansion of this parasitic threat.”
Heterobilharzia americana is endemic to the Gulf Coast and South Atlantic region of North America, but has also been found in states such as Indiana, Tennessee, Oklahoma, Arkansas, and most recently, Utah.
Along with dogs, it can infect mammals such as raccoons, marsh rabbits, horses, nutria, bobcats, mountain lions and opossums, the study said.
Eleven dogs in three counties have been confirmed to have the disease and one has died, the UC Riverside News said. (iStock)
Once inside the skin, the parasite migrates into the lungs where it can cause hemorrhaging.
“It gets into the veins of the intestinal lining, and that’s where it develops into an adult and mates,” Dillman told the UC Riverside News. “The presence of the adults in the veins isn’t the problem. It’s the eggs that get into the lungs, spleen, liver, and heart. The immune system tries to deal with it, and hard clusters of immune cells called granulomas form. Eventually, the organ tissues stop functioning.”
Eleven dogs in three counties have been confirmed to have the disease, and one has died, the UC Riverside News said, adding that symptoms, including “loss of appetite, and eventually include vomiting, diarrhea, profound weight loss, and signs of liver disease,” can take months to show up.
“Treatment typically involves use of multiple medications and close monitoring of the dog by a veterinarian,” Emily Beeler, a veterinarian with the Los Angeles County Department of Public Health, told the newspaper.
The parasite can cause swimmer’s itch in humans, but not an infection.
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Eating too much salt has long been linked to high blood pressure, but new research suggests it could trick the immune system into prematurely aging the blood vessels.
A preclinical study recently published in the Journal of the American Heart Association has identified a biological chain reaction that links a salty diet to cardiovascular decay.
Scientists at the University of South Alabama observed that mice on a high-salt diet experienced rapid deterioration in their blood vessel function.
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After just four weeks of high sodium intake, the small arteries responsible for regulating blood flow lost their ability to relax, according to a press release.
The team found that the cells lining these vessels had entered a state of cellular senescence, a form of premature cellular aging in which cells stop dividing and release a mix of inflammatory signals that can damage surrounding tissue.
Excess salt has long been linked to high blood pressure, but a new study goes deeper into its effects on the cardiovascular system. (iStock)
The researchers tried to replicate this damage by exposing blood vessel cells directly to salt in a laboratory dish, but the cells showed no harmful effects.
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This suggests that salt isn’t directly causing damage to the vascular lining but that the real culprit may be the body’s own defense mechanism, the researchers noted.
Excess salt may trigger the immune system to release a molecule called interleukin-16 (IL-16), which acts as a messenger that instructs blood vessel cells to grow old before their time, according to the study.
Excess salt may trigger the immune system to release a molecule called interleukin-16, which acts as a messenger that instructs blood vessel cells to grow old before their time, according to the study. (iStock)
Once these cells age, they fail to produce nitric oxide, the essential gas that tells arteries to dilate and stay flexible.
To test whether this process could be reversed, the team turned to a class of experimental drugs known as senolytics.
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Using a cancer medication called navitoclax, which selectively clears out aged and dysfunctional cells, the researchers were able to restore nearly normal blood vessel function in the salt-fed mice, the release stated.
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By removing the decaying cells created by the high-salt diet, the drug allowed the remaining healthy tissue to maintain its elasticity and respond correctly to blood flow demands.
Excess salt may trigger the immune system into stopping the cells from dividing, the study suggests. (iStock)
The study did have some limitations. The transition from mouse models to human treatment remains a significant hurdle, the team cautioned.
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Senolytic drugs like navitoclax are still being studied for safety, and the team emphasized that previous trials have shown mixed results regarding their impact on artery plaque.
Additionally, the researchers have not yet confirmed whether the same IL-16 pathway is the primary driver of vascular aging in humans.
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Eating a diet high in fruits and vegetables was found to have a surprising link to lung cancer among younger non-smokers, early research suggests.
The observational study, led by Jorge Nieva, M.D., of the USC Norris Comprehensive Cancer Center at Keck Medicine, was presented this month at the American Association for Cancer Research (AACR) annual meeting in San Diego. It has not yet been peer-reviewed.
Researchers looked at dietary, smoking and demographic data for 187 patients who were diagnosed with lung cancer at age 50 or younger.
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They found that among non-smokers, there was a link between healthier-than-average diets – rich in fruits, vegetables and whole grains – and the chance of lung cancer development.
Young lung cancer patients ate more servings of dark green vegetables, legumes and whole grains compared to the average U.S. adult, the researchers found.
Eating a diet high in fruits and vegetables was found to have a surprising link to lung cancer among younger non-smokers, early research suggests. (iStock)
The researchers hypothesized that pesticides applied to conventionally grown produce could be a possible factor in the disease association.
“Commercially produced (non-organic) fruits, vegetables and whole grains are more likely to be associated with a higher residue of pesticides than dairy, meat and many processed foods,” according to Nieva. He also noted that agricultural workers exposed to pesticides tend to have higher rates of lung cancer.
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“There is a large subset of lung cancer patients whose disease is not caused by smoking,” Nieva told Fox News Digital.
The disease is becoming more common in non-smokers 50 and younger, especially women – despite the fact that smoking rates have been falling for decades, the researcher noted.
The researchers hypothesized that pesticides applied to conventionally grown produce could be a possible factor in the disease association. (iStock)
“These patients tend to have eaten much healthier diets before their diagnosis than the average American,” he went on. “We need to support research into understanding why Americans – and women in particular – who no longer smoke very much are still having lung cancer,” he said.
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The study did have some limitations, Nieva acknowledged, primarily that it relied on survey data and was limited by the participants’ memories of their food intake.
“Also, the survey participants were self-selected, and this could have biased the findings,” he told Fox News Digital.
“There is a large subset of lung cancer patients whose disease is not caused by smoking.”
The researchers did not test specific foods for pesticides, relying instead on average pesticide levels for certain types of food. Looking ahead, they plan to test patients’ blood and urine samples to directly measure pesticide levels, Nieva said.
Although the study shows only an association and does not prove that pesticides caused lung cancer, Nieva recommends that people wash their produce before eating and choose organic foods whenever possible.
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“This work represents a critical step toward identifying modifiable environmental factors that may contribute to lung cancer in young adults,” said Nieva. “Our hope is that these insights can guide both public health recommendations and future investigation into lung cancer prevention.”
“It is possible that the increased lung cancer risk could be due to pesticide exposure in whole farmed foods, but is by no means certain,” a doctor said. (AP Photo/Charlie Neibergall)
Dr. Marc Siegel, Fox News senior medical analyst, said the study is “interesting,” but that it “raises far more questions than it answers.”
“It is a small study (around 150) and observational, so no proof,” the doctor, who was not involved in the research, told Fox News Digital.
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“It is possible that the increased lung cancer risk could be due to pesticide exposure in whole farmed foods, but it is by no means certain,” Siegel went on. “How much exposure is needed? How much of it gets into food and in which areas? This requires much further study.”
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Kayla Nichols, communications director for Pesticide Action & Agroecology Network, a distributed global network, said the organization agrees with the study’s conclusion that more research should be done on the rise in lung cancer, particularly in individuals eating diets higher in produce and fiber.
“There is a large subset of lung cancer patients whose disease is not caused by smoking,” the researcher told Fox News Digital. (iStock)
“There is a bounty of existing research that already links pesticide exposure to increased risk of multiple types of cancers,” Nichols, who was also not involved in the study, told Fox News Digital. She called for more research on chronic, low-level exposures to pesticides, as well as more effective policies to protect the public from pesticide residues on food.
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The study was supported by the National Institutes of Health and the National Cancer Institute, as well as industry partners including AstraZeneca and Genentech, among others.
Fox News Digital reached out to several pesticide companies and trade groups for comment.
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