Health

Amid bird flu spread, experts reveal if it's safe to drink milk: 'Indirect concern'

Published

2 years ago

April 27, 2024

Amid bird flu spread, experts reveal if it's safe to drink milk: 'Indirect concern'

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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.

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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.

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

“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.

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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.

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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.

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“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.”

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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.

Melissa Rudy is health editor and a member of the lifestyle team at Fox News Digital. Story tips can be sent to melissa.rudy@fox.com.

Health

Common nighttime noise exposure may trigger heart problems, study suggests

Published

1 hour ago

February 28, 2026

Press Room

Common nighttime noise exposure may trigger heart problems, study suggests

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Living near heavy traffic could negatively impact your heart health.

A European study, published in the journal Environmental Research, found that exposure to nighttime road traffic noise is linked to changes in the blood, leading to worsened cholesterol and cardiovascular risks.

The researchers considered data from the U.K. Biobank, Rotterdam Study, and Northern Finland Birth Cohort 1966, including more than 272,000 adults over the age of 30, according to a press release.

Nighttime road noise exposure was estimated at all participants’ homes based on national noise maps. Researchers also took blood samples to measure the participants’ metabolic biomarkers for disease, then mapped the link between nightly noise levels and existence of biomarkers.

Exposure to loud noise was associated with increased concentrations of cholesterol-related biomarkers. (iStock)

The study found that people exposed to louder noise at night — especially sounds above 55 decibels — showed changes in 48 different substances in their blood. Twenty of these associations “remained robust” throughout all cohorts.

Exposure to loud noise was associated with increased concentrations of cholesterol-related biomarkers, especially LDL “bad” cholesterol, IDL (intermediate-density lipoprotein) and unsaturated fatty acids.

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As noise levels increased, starting at around 50 decibels, cholesterol markers rose steadily, the release stated.

The authors concluded that this study “provides evidence that nighttime road traffic noise exposure from 50 dB upward is associated with alterations in blood cholesterol and lipid profiles in adults.”

Researchers noted a link between traffic noise and cardiometabolic disease. (iStock)

Study co-author Yiyan He, doctoral researcher at the University of Oulu in Finland, noted that in this type of research, small effect sizes are expected, and environmental exposures such as traffic noise are “typically modest.”

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“Despite this, we observed statistically robust and consistent associations across many biomarkers, especially those related to LDL and IDL lipoproteins,” she told Fox News Digital.

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“We also identified a clear exposure-response pattern starting at around 50 dB, suggesting that metabolic changes become more evident as noise levels increase.”

This aligns with public health guidance, as the World Health Organization recommends lower nighttime noise limits at around 40 to 45 dB, Yiyan He added.

“This finding may clarify the association between traffic noise and cardiometabolic diseases,” the researchers wrote. (iStock)

“The 55 dB level is often used as an interim benchmark associated with substantial noise annoyance and sleep disturbance,” she said. “In our study, we observed associations not only at 55 dB, but also indications of effects emerging at around 50 dB.”

The strength and consistency of the cholesterol-related associations were surprising, as these changes are usually “subtle.”

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“Instead, we found consistent associations across multiple large European cohorts, which strengthens confidence that the findings may reflect real biological patterns,” Yiyan He went on. “We were also interested to see that effects were minimal below ~50 dB, suggesting a possible threshold-like pattern.”

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The researcher noted that these findings were consistent across genders, education levels and obesity status.

The study was restricted to White Europeans, which posed a limitation. There was also a lack of information on the fasting status in the UK Biobank.

Changes in cholesterol levels were more severe than researchers expected. (iStock)

“Fasting can influence levels of certain metabolites, particularly fatty acids,” Yiyan He said. “However, based on UK Biobank documentation, fewer than 10% of participants were fasting for at least eight hours, and our main findings focused on cholesterol-related biomarkers, which are generally less sensitive to short-term fasting.”

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The researchers also lacked information on bedroom location, indoor noise exposure and time spent at home.

“These factors may introduce non-differential exposure misclassification,” Yiyan He said. “Additionally, noise exposure estimates were based on participants’ temporary residential addresses at the time of blood sampling, without considering the duration of residence.”

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“Many of these limitations would tend to bias results toward the null, so the consistent associations we observed remain noteworthy.”

Experts recommend taking measures to limit traffic noise at night. (iStock)

Based on this latest research, Yiyan He noted that nighttime noise is a “health-relevant exposure,” not just “an annoyance.”

“Our findings suggest that nighttime traffic noise may subtly but consistently affect metabolic health,” she said. “While the changes in cholesterol and lipid levels for any one individual are small, traffic noise affects a very large number of people, which means the potential public health impact could be substantial.”

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The researcher recommends taking measures like improving sound insulation, using noise-reducing strategies and placing bedrooms on the quieter side of the home when possible.

“Because sleep is a key pathway linking noise to health, protecting the nighttime sleep environment is especially important,” she added.

Angelica Stabile is a lifestyle reporter for Fox News Digital.

Health

The Best Time To Drink Coffee for Weight Loss and a Faster Metabolism

Published

13 hours ago

February 27, 2026

Press Room

The Best Time To Drink Coffee for Weight Loss and a Faster Metabolism

The Best Time To Drink Coffee for Weight Loss and Fat Burn | Woman’s World

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