Traces of bird flu have been detected in pasteurized milk — leaving many people wondering if it’s safe to drink.

The U.S. Food and Drug Administration (FDA) released a notice on Thursday stating that one in five retail samples of commercial milk tested positive for fragments of highly pathogenic avian influenza (HPAI), more commonly known as bird flu or avian flu.

The share of milk with viral remnants was higher in areas where herds of cattle had been infected.

BIRD FLU PANDEMIC IN FUTURE? EU WARNS OF POTENTIAL SPREAD TO HUMANS DUE TO ‘LACK OF IMMUNE DEFENSE’

The presence of the virus in the milk doesn’t necessarily mean there is a risk to consumers, however, the FDA noted.

“Additional testing is required to determine whether an intact pathogen is still present and if it remains infectious, which would help inform a determination of whether there is any risk of illness associated with consuming the product,” the agency stated.

“Although bird flu viruses do not normally infect humans, sporadic human infections have occurred,” the FDA stated in the alert.

Pasteurization eliminates risk, experts say

Before milk can be sold commercially, government regulations require that it is pasteurized.

During the pasteurization process, raw milk is heated to a certain temperature for a brief period of time and is then chilled again, according to the International Dairy Foods Association (IDFA) website.

This process kills any pathogens and ensures that milk is safe to drink.

BIRD FLU VIRUS FOUND IN GROCERY STORE MILK, BUT NO RISK TO CUSTOMERS, FDA SAYS

Dr. Scott Pegan, professor of biomedical sciences at the University of California, Riverside and a biochemist for the United States Medical Research Institute of Chemical Defense, said the FDA’s finding does not mean there is any direct risks to consumers.

“In the U.S., commercial intrastate sold milk is required to be pasteurized,” he told Fox News Digital. “This process is geared to kill viruses like H5N1 and other bacteria that can pose a threat to human health.”

A milk pasteurization system is shown at a food and drink exhibition. Pasteurization is a process that kills microbes in food and drink, such as milk, juice, canned food and others. (iStock)

“Milk that has been pasteurized is safe and there is no current reason to avoid it or other pasteurized milk products based on the FDA’s findings,” Pegan went on. 

“However, there is a substantial risk of consuming unpasteurized milk and products of that milk.”

Even after viruses and bacteria have been killed in pasteurized milk, remnants can remain in the milk, he said — but they are not dangerous.

RARE HUMAN CASE OF HIGHLY CONTAGIOUS BIRD FLU CONFIRMED IN TEXAS

Edward Liu, M.D., chief of infectious diseases at Hackensack Meridian Jersey Shore University Medical Center in New Jersey, agreed that there is not a risk associated with drinking pasteurized milk.

“The pasteurization is the key — the heat treatment kills off the viruses,” he told Fox News Digital. “Although the FDA’s testing picked up fragments [of the virus], the heating process destroyed it, so it’s not able to infect people.”

The share of milk with viral remnants was higher in areas where herds of cattle had been infected. (iStock)

The fragments alone are not enough to cause any kind of infection, he confirmed.

“I think the key word is ‘fragments.’ Just like with COVID, if you do a PCR test a month later, we’ll detect little fragments of the virus, but it’s not active anymore,” Liu said. 

“So if the virus isn’t entirely intact, it shouldn’t be able to infect you.”

Any sporadic cases of human infection would likely occur when a farmer is handling birds directly, Liu said.

Consumers should avoid drinking raw milk that has not been pasteurized, the FDA said.

“There are some people who like to go all natural, but pasteurization has been used for decades for safety,” he said. “Some degree of processing is actually better and safer for us.”

Animals pose greater concern, experts say

The “indirect concern” within the scientific and medical community involves the increased risk of “spillover” to humans from animals with the H5N1 virus, said Pegan. 

“Prior to the outbreak in dairy cattle, this concern principally revolved around the risk of transmission to humans from wild birds or poultry,” he told Fox News Digital.

The “indirect concern” within the scientific and medical community involves the increased risk of “spillover” to humans from animals with the H5N1 virus, one expert said. (REUTERS/Dado Ruvic/Illustration/File Photo)

“The presence of H5N1 avian flu in the milk of these cattle shows that cattle may be able to provide a new reservoir for this virus, increasing the odds of exposure to those in direct contact with the infected cattle.”

The more animals that are infected, the higher chance that humans may come in direct contact with the virus — which likely would lead to a greater number of human cases, said Pegan. 

SOCIAL MEDIA USERS UPSET AS SHETLAND PONY IS STUCK IN CATTLE GRID FOR 4 HOURS WITH CREWS TOILING TO FREE HIM

“The case of cattle-to-human transmission seen in Texas is in line with this concern,” he noted. 

“Also, the more mammals infected increases the chances that the virus will adapt to other mammals, such as humans.”

FDA’s recommendations

The FDA restated its “long-standing recommendation” that consumers avoid drinking raw milk that has not been pasteurized. 

The agency also recommends that companies refrain from manufacturing or selling raw milk or raw milk products made with milk from cows that tested positive for bird flu, were exposed to the virus or showed symptoms of illness.

“Over the past few years, there has been an increased consumer demand for these unpasteurized products,” Pegan said. 

The FDA restated its “long-standing recommendation” that consumers avoid drinking raw milk that has not been pasteurized.  (iStock)

“While not allowed to be sold via interstate brands, some states have relaxed local sales of these products at farmer’s markets and similar outlets,” he said. 

“Individuals may want to avoid those unpasteurized products until more information is obtained about this H5N1 avian flu outbreak in dairy cattle.”

CLICK HERE TO SIGN UP FOR OUR HEALTH NEWSLETTER

The FDA also urged producers to “take precautions” when discarding milk from affected cows, “so that the discarded milk does not become a source of further spread.”

So far, only one person has been confirmed to have contracted the virus after exposure to infected cows, the FDA stated.

“The CDC says the risk to the general public remains low,” the agency said.

“The FDA and USDA continue to indicate that, based on the information we currently have, our commercial milk supply is safe.”

Fox News Digital reached out to the National Milk Producers Federation, the American Dairy Association and the International Dairy Foods Association for comment.

For more Health articles, visit www.foxnews.com/health.

• Lisa Pisano faced heart and kidney failure, rendering her ineligible for traditional transplants, but a pioneering procedure at NYU Langone Health offered hope.
• Doctors implanted a mechanical heart pump to stabilize Pisano’s failing heart, followed by a kidney transplant from a genetically modified pig.
• Pisano’s recovery is progressing well, marking a significant advancement in animal-to-human transplantation.

Doctors have transplanted a pig kidney into a New Jersey woman who was near death, part of a dramatic pair of surgeries that also stabilized her failing heart.

Lisa Pisano’s combination of heart and kidney failure left her too sick to qualify for a traditional transplant, and out of options. Then doctors at NYU Langone Health devised a novel one-two punch: Implant a mechanical pump to keep her heart beating and days later transplant a kidney from a genetically modified pig.

Pisano is recovering well, the NYU team announced Wednesday. She’s only the second patient ever to receive a pig kidney — following a landmark transplant last month at Massachusetts General Hospital – and the latest in a string of attempts to make animal-to-human transplantation a reality.

MASSACHUSETTS MAN, RECIPIENT OF FIRST SUCCESSFUL PIG KIDNEY TRANSPLANT, IS DISCHARGED FROM HOSPITAL

This week, the 54-year-old grasped a walker and took her first few steps.

“I was at the end of my rope,” Pisano told The Associated Press. “I just took a chance. And you know, worst case scenario, if it didn’t work for me, it might have worked for someone else and it could have helped the next person.”

Dr. Robert Montgomery, director of NYU Langone Transplant Institute, recounted cheers in the operating room as the organ immediately started making urine.

“It’s been transformative,” Montgomery said of the experiment’s early results.

But “we’re not off the hook yet,” cautioned Dr. Nader Moazami, the NYU cardiac surgeon who implanted the heart pump.

“With this surgery I get to see my wife smile again,” Pisano’s husband Todd said Wednesday.

FEDS INVESTIGATE TEXAS SURGEON ACCUSED OF DENYING PATIENTS LIFE-SAVING LIVER TRANSPLANTS

Other transplant experts are closely watching how the patient fares.

“I have to congratulate them,” said Dr. Tatsuo Kawai of Mass General, who noted that his own pig kidney patient was healthier overall going into his operation than NYU’s patient. “When the heart function is bad, it’s really difficult to do a kidney transplant.”

THE PIG ORGAN QUEST

More than 100,000 people are on the U.S. transplant waiting list, most who need a kidney, and thousands die waiting. In hopes of filling the shortage of donated organs, several biotech companies are genetically modifying pigs so their organs are more humanlike, less likely to be destroyed by people’s immune system.

NYU and other research teams have temporarily transplanted pig kidneys and hearts into brain-dead bodies, with promising results. Then the University of Maryland transplanted pig hearts into two men who were out of other options, and both died within months.

Mass General’s pig kidney transplant last month raised new hopes. Kawai said Richard “Rick” Slayman experienced an early rejection scare but bounced back enough to go home earlier this month and still is faring well five weeks post-transplant. A recent biopsy showed no further problems.

A COMPLEX CASE AT NYU

Pisano is the first woman to receive a pig organ — and unlike with prior xenotransplant experiments, both her heart and kidneys had failed. She went into cardiac arrest and had to be resuscitated before the experimental surgeries. She’d gotten too weak to even play with her grandchildren. “I was miserable,” the Cookstown, New Jersey, woman said.

A failed heart made her ineligible for a traditional kidney transplant. But while on dialysis, she didn’t qualify for a heart pump, called a left ventricular assist device or LVAD, either.

“It’s like being in a maze and you can’t find a way out,” Montgomery explained — until the surgeons decided to pair a heart pump with a pig kidney.

TWO SURGERIES IN EIGHT DAYS

With emergency permission from the Food and Drug Administration, Montgomery chose an organ from a pig genetically engineered by United Therapeutics Corp. so its cells don’t produce a particular sugar that’s foreign to the human body and triggers immediate organ rejection.

Plus a tweak: The donor pig’s thymus gland, which trains the immune system, was attached to the donated kidney in hopes that it would help Pisano’s body tolerate the new organ.

Surgeons implanted the LVAD to power Pisano’s heart on April 4, and transplanted the pig kidney on April 12. There’s no way to predict her long-term outcome but she’s shown no sign of organ rejection so far, Montgomery said. And in adjusting the LVAD to work with her new kidney, Moazami said doctors already have learned lessons that could help future care of heart-and-kidney patients.

Special “compassionate use” experiments teach doctors a lot but it will take rigorous studies to prove if xenotransplants really work. What happens with Pisano and Mass General’s kidney recipient will undoubtedly influence FDA’s decision to allow such trials. United Therapeutics said it hopes to begin one next year.

This story discusses suicide. If you or someone you know is having thoughts of suicide, please contact the Suicide & Crisis Lifeline at 988 or 1-800-273-TALK (8255).

Chronic lack of sleep can cause a long list of physical and mental issues — and for one young man, his mother believes it led to his death.

Derek McFadden was just 23 when he took his own life on Aug. 17, 2018, in Tucson, Arizona.

His mother, Robin McFadden, who lives in Tuxedo Park, New York, said she believes her son’s insomnia was the “only driver” of his suicide.

SLEEP DISORDERS AND SUICIDE: A MENTAL HEALTH EXPERT REVEALS THE CONCERNING LINK

Derek McFadden was an “extremely funny kid” who loved swimming, snow-skiing and cuddling, his mother said — but for most of his life, he struggled with debilitating insomnia.

At around 8 years old, he started taking small doses of sleeping medication, which helped for several years.

Around the time he turned 18, during his senior year of high school, the medication stopped working, McFadden said.

“He never got a good night’s sleep, but he soldiered through his school day and then would come home and lie down on his bed, exhausted, but couldn’t fall asleep,” she told Fox News Digital in an interview.

SUICIDE WARNING SIGNS ARE MISSED BY MOST AMERICANS, NEW SURVEY FINDS: IT’S ‘ALARMING’

McFadden took her son to multiple doctors and they tried different medications — none of which worked, she said. 

“Derek would just lie there at night, and he was so tired, but he couldn’t fall sleep,” she said.

Amid the sleep struggles, her son managed to graduate from high school — but things got even worse when he left for college at the University of Arizona.

Derek McFadden, left, is pictured with his older brother Jake McFadden. (Robin McFadden)

He’d chosen Arizona because he was an “avid outdoorsman” who loved fly-fishing, going off-roading in his Jeep and spending time with his dog, which he’d adopted for emotional support.

“Our hope was that with Derek being in Arizona, the sunshine during the day would stimulate his brain to wake up so he could go to sleep at night, but it just didn’t work,” McFadden said.

The doctor’s visits continued, but none of the experts could figure out what was causing the insomnia. 

“There was something wrong in his brain that was preventing him from sleeping.”

“Every doctor would assume it was sleep hygiene, and that he was doing something wrong,” McFadden said.

AMERICANS NEED MORE SLEEP, LESS STRESS, EXPERTS SAY, AS GALLUP POLL REVEALS TROUBLING FINDINGS

“They assumed that because he was 18, 19 or 20 years old that he was playing video games all night.”

She added, “But Derek knew sleep hygiene. He had done so much research on his own. There was something wrong in his brain that was preventing him from sleeping.” 

Derek McFadden, far left, is pictured with his brother, mother and father. (Robin McFadden)

The family looked into holistic approaches, including hypnosis, acupuncture and “brain training,” but “nothing seemed to work,” McFadden said.

Many nights, he would go the entire night without sleeping — sometimes up to three days in a row, she said.

“It was really, really bad,” McFadden said.

Physical and mental toll

As the months went by and sleep continued to elude her son, McFadden said it began to take a toll on his immune system.

After consecutive nights without sleeping, he developed bruises all around his eyes.

SUICIDE RATES REACH ALL-TIME HIGH IN US, PER CDC DATA

“Derek was constantly getting sick, and that made him feel like he was not a normal kid,” she said. “He just couldn’t fight anything off. He was always at Urgent Care.”

Her son developed severe acid reflux and stomach pain, to the point where it became difficult for him to eat.

“Sometimes his insomnia got so severe that he couldn’t keep any food or fluids down at all,” McFadden said. 

Multiple times, he ended up in the emergency room with dehydration and severe cramping, she said.

Derek was an “avid outdoorsman” who loved fly-fishing, going off-roading in his Jeep and spending time with his dog, which he’d adopted for emotional support, his mother said. (Robin McFadden)

The lack of sleep also changed her son’s demeanor and personality, McFadden said.

“Derek had tremendous mood swings — he became anxiety-ridden and depressed,” she recalled.

“He would have hallucinations, and was constantly losing things. He couldn’t think clearly.”

On the rare occasion that her son had a good night’s sleep, McFadden said, he was “a completely different person, as happy as could be.”

IMPROVE YOUR SLEEP BY OPTIMIZING 6 BIOMARKERS: ‘INTEGRAL TO HEALTH’

“It broke my heart, because he was such a happy, funny, huge-hearted person, and it was really sad to watch his decline.”

Unable to keep up with his studies, her son had to drop out of college.

“He couldn’t even hold a job because he couldn’t sleep at night,” McFadden said. 

“He saw there was no cure, no future, and he just didn’t see a point in going on.”

In July 2018, when her son came home from Tucson for the summer, McFadden knew something had shifted.

“We were sitting on the sofa and he said to me, ‘Mom, I’m gonna die young,’” she recalled. 

“And I said, ‘Derek, why do you say that?’ And he said, ‘Because my mind and body can’t take the sleep deprivation.’”

Derek McFadden, left, is pictured with his older brother. After the tragedy, his mother said she realized her son had likely been planning his suicide in recent weeks. (Robin McFadden)

Her son had also expressed that he didn’t want to have children because he didn’t want to pass on the disorder, McFadden said.

“He saw there was no cure, no future, and he just didn’t see a point in going on,” she said. “Physically, he was starting to fall apart, and mentally, his cognitive ability was going.”

“Physically, he was starting to fall apart.”

Four weeks later, McFadden got an early-morning call from the Tucson Police Department notifying her that her son had taken his life.

After the tragedy, McFadden realized that her son had likely been planning his suicide in recent weeks.

FOR QUALITY SLEEP, TIMING IS EVERYTHING, EXPERTS SAY: HERE’S THE SECRET OF SUCCESSFUL SLUMBER

“He had contacted some old friends, and in his text messages and phone calls, he sounded very serene, relieved and calm,” she recalled. “I truly believe Derek had made the decision. He just saw no future for himself.”

The sleep-suicide link

Studies have suggested a likely connection between sleep and suicide.

Research published in the journal Current Psychiatry Reports found that treating insomnia and nightmares, or addressing the source of those issues, could help prevent “the rising threat of suicide.”

“Sleep is crucial for emotional and psychological balance.”

Dr. Brett Osborn, a Florida neurologist and longevity expert with the firm Senolytix, said there is a “significant body of research” suggesting a link between sleep deprivation and an increased risk of suicide. 

“Sleep is crucial for emotional and psychological balance,” he told Fox News Digital in an interview.

“Lack of sleep can lead to mood disturbances, irritability and decreased stress tolerance, all of which can worsen feelings of despair or depression — potentially leading to suicidal thoughts.”

On the rare occasion that her son had a good night’s sleep, McFadden said, he was “a completely different person, as happy as could be.” Derek McFadden is pictured here with his mother, Robin McFadden. (Robin McFadden)

Sleep deprivation can also affect cognitive functions, the doctor continued. 

“This impairment can make it harder for individuals to see alternative solutions to problems or seek help, potentially increasing the risk of suicidal behavior,” he said.

LACK OF SLEEP COULD BE A FACTOR IN A ‘SILENT EPIDEMIC,’ EXPERTS WARN

Sleep problems are also commonly associated with psychiatric disorders, such as depression and anxiety, which are themselves significant risk factors for suicide, according to Osborn.

“Sleep pathology is extremely complex and challenging, because sleep itself is poorly understood.”

“Insomnia and disrupted sleep patterns are particularly prevalent in these conditions,” he warned. “This can be a source of diagnostic confusion and resultant treatment errors.”

Sleep also affects various biological processes, Osborn noted — “including the regulation of neurotransmitters like serotonin (which is involved in mood regulation) and stress hormones like cortisol.”

Derek McFadden was an “extremely funny kid” who loved swimming, snow-skiing and cuddling, his mother said. (Robin McFadden)

“Chronic sleep deprivation may lead to dysregulation in these systems, which could contribute to depressive symptoms and suicidal ideation.”

While the majority of insomnia patients respond to lifestyle changes and/or medications, Osborn noted, there is a subset of patients who are “more difficult to manage.”

“Often, there are underlying medical problems, like reflux, that fly under the radar and predispose the individual to insomnia,” he told Fox News Digital. 

Derek McFadden, center, in cap and gown, is pictured with his family at his high-school graduation.  (Robin McFadden)

“Another issue is the potentially reciprocal relationship between depression and anxiety,” Osborn said.

“Sleep pathology is extremely complex and challenging, because sleep itself is poorly understood,” he continued. “A multimodal, interdisciplinary approach — involving a psychiatrist and a sleep specialist — is always best.”

SURPRISING SLEEP TRENDS REVEALED IN NEW SURVEY, INCLUDING THE RISE OF ‘SCANDINAVIAN SLEEPING’

Dr. Marc Siegel, clinical professor of medicine at NYU Langone Medical Center and a Fox News medical contributor, agreed that there is a proven link between insomnia, stress, anxiety and depression.

“Since suicide is a manifestation of severe depression, I think there is a link there, too, though insomnia wouldn’t be the entire cause,” he told Fox News Digital.

Fly-fishing was one of Derek McFadden’s favorite hobbies. (Robin McFadden)

Siegel refers to it as a “cycle of worry.”

“Anxiety interferes with sleep, which then makes you more anxious and more sleepless, especially if you add caffeine to combat the grogginess,” he said.

During sleep, the brain relaxes and “cleanses” itself, Siegel said.

CLICK HERE TO SIGN UP FOR OUR HEALTH NEWSLETTER

“Waking up refreshed can improve mood, especially when accompanied by exercise,” he noted. 

For those with severe insomnia, Siegel recommends undergoing a full sleep study/evaluation — typically with an EEG or video monitoring — to help determine the causes.

“Severe, resistant cases require evaluations by sleep specialists, neurologists and psychiatrists,” he added.

Call for awareness

The most “disheartening” part of her son’s tragedy, according to McFadden, was a lack of support from the health community, in her view.

“Other than sleep apnea and bad sleep hygiene, the medical community does not seem to believe that severe insomnia really exists,” she told Fox News Digital. 

“And that just infuriates me.”

Today, McFadden’s goal is to raise awareness of chronic insomnia — “because there are so many people in this world who are suffering from this.”

For more Health articles, visit www.foxnews.com/health.