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COVID-19 virus could attack cancer cells and shrink tumors, new study suggests

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COVID-19 virus could attack cancer cells and shrink tumors, new study suggests

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COVID-19 can cause a long list of health issues, including flu symptoms, respiratory problems and even organ damage, according to medical experts — but a new study suggests that the virus could have a surprising impact on cancer.

The study, which was published in the Journal of Clinical Investigation on Friday, found that COVID infection was linked to cancer regression, which could serve as a foundation for new cancer treatments in the future.

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The SARS-CoV-2 virus — which causes COVID — is made up of RNA (ribonucleic acid), a molecule that is found in all living cells.

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In the study, RNA was found to “trigger the development of a unique type of immune cell with anti-cancer properties,” according to a press release from the Northwestern Medicine Canning Thoracic Institute in Chicago.

Dr. Ankit Bharat’s research team is pictured at the Northwestern Medicine lab. (Northwestern Medicine)

The newly created immune cells were able to move into the blood vessels and tumors — something typical immune cells cannot do.

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“These killer cells then swarm the tumor and start attacking the cancer cells directly, helping to shrink the tumor,” noted senior author Ankit Bharat, MD, chief of thoracic surgery at Northwestern Medicine, in the release.

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This effect was activated by severe COVID-19, the researchers found, and was specifically seen to be effective against melanoma, lung cancer, breast cancer and colon cancer.

“This discovery opens up a new avenue for cancer treatment,” Bharat said in the release.

“It offers hope that we might be able to use this approach to benefit patients with advanced cancers who have not responded to other treatments.”

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Early findings warrant more research

This finding has so far only been seen in animal models.

“We are in the early stages, but the potential to transform cancer treatment is there,” Bharat said in the release. 

“Our next steps will involve clinical trials to see if we can safely and effectively use these findings to help cancer patients,” the study author said. (iStock)

“Our next steps will involve clinical trials to see if we can safely and effectively use these findings to help cancer patients.”

“The presumed mechanism is that a major inflammation event like an infection can tip the scales toward activating the immune system against a cancer.”

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Dr. Marc Siegel, clinical professor of medicine at NYU Langone Health and senior medical analyst for Fox News, pointed out that while this is “not a cancer cure and was only seen in mice,” the study does have some significance.

“It reminds us that viruses cause inflammation and rev up the immune system, which can either increase your risk of certain cancers or, paradoxically, cause certain cancers to shrink by activating immune cells against them,” Siegel, who was not involved in the study, told Fox News Digital.

      

Dr. Jacob Glanville, CEO of Centivax, a San Francisco biotechnology company, also was not involved in the study but said he wasn’t surprised by the findings.

“There’s a known history of this phenomenon of ‘spontaneous regression’ following an infection with a high fever in multiple illnesses, dating back as far as doctors have been identifying cancer,” he told Fox News Digital.

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In the study, RNA was found to “trigger the development of a unique type of immune cell with anti-cancer properties,” according to a press release. (Northwestern Medicine)

“Normally, the immune system can tell there’s something wrong with cancerous tissue, but cancers develop various mutations to hold the immune system back from attacking them,” Glanville went on.

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“The presumed mechanism is that a major inflammation event like an infection can tip the scales toward activating the immune system against cancer.”

The Northwestern Medicine building is pictured in Chicago, Illinois. (Northwestern Medicine)

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Studies have shown that COVID-19 vaccines could have the same effect, he added, but it’s likely more common for an actual infection to cause this, as the immune system is more “riled up” by the infection.

Even so, Glanville added, “The rate of this happening likely isn’t yet high enough to justify it as a reliable therapy.”

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The study was funded by the National Institutes of Health and Canning Thoracic Institute.

Fox News Digital reached out to the researchers for additional comment.

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Experts Call It 2026’s Best Diet— ‘The Results Are Often Stunning’

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Experts Call It 2026’s Best Diet— ‘The Results Are Often Stunning’


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Deadly ‘superbug’ is spreading across US as drug resistance grows, researchers warn

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Deadly ‘superbug’ is spreading across US as drug resistance grows, researchers warn

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A deadly, drug-resistant fungus already spreading rapidly through U.S. hospitals is becoming even more threatening worldwide, though there may be hope for new treatments, according to a new scientific review.

Candida auris (C. auris), often described as a “superbug fungus,” is spreading globally and increasingly resisting human immune systems, Hackensack Meridian Center for Discovery and Innovation (CDI) researchers said in a review published in early December.

The findings reinforce prior CDC warnings that have labeled C. auris an “urgent antimicrobial threat” — the first fungal pathogen to receive that designation — as U.S. cases have surged, particularly in hospitals and long-term care centers.

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Approximately 7,000 cases were identified across dozens of U.S. states in 2025, according to the CDC, and it has reportedly been identified in at least 60 countries.

Candida auris is a drug-resistant fungus spreading in hospitals worldwide. (Nicolas Armer/Picture Alliance via Getty Images)

The review, published in Microbiology and Molecular Biology Reviews, helps explain why the pathogen is so difficult to contain and warns that outdated diagnostics and limited treatments lag behind. It was conducted by Dr. Neeraj Chauhan of the Hackensack Meridian CDI in New Jersey, Dr. Anuradha Chowdhary of the University of Delhi’s Medical Mycology Unit and Dr. Michail Lionakis, chief of the clinical mycology program at the National Institutes of Health.

Their findings stress the need to develop “novel antifungal agents with broad-spectrum activity against human fungal pathogens, to improve diagnostic tests and to develop immune- and vaccine-based adjunct modalities for the treatment of high-risk patients,” the researchers said in a statement.

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“In addition, future efforts should focus on raising awareness about fungal disease through developing better surveillance mechanisms, especially in resource-poor countries,” they added. “All these developments should help improve the outcomes and prognosis of patients afflicted by opportunistic fungal infections.”

Candida auris can survive on skin and hospital surfaces, allowing it to spread easily. (iStock)

First identified in 2009 from a patient’s ear sample in Japan, C. auris has since spread to dozens of countries, including the U.S., where outbreaks have forced some hospital intensive care units to shut down, according to the researchers.

The fungus poses the greatest risk to people who are already critically ill, particularly those on ventilators or with weakened immune systems. Once infected, about half of patients may die, according to some estimates.

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Unlike many other fungi, C. auris can survive on human skin and cling to hospital surfaces and medical equipment, allowing it to spread easily in healthcare settings.

“It is resistant to multiple antifungal drugs, and it tends to spread in hospital settings, including on equipment being used on immunocompromised and semi-immunocompromised patients, such as ventilators and catheters,” Dr. Marc Siegel, Fox News senior medical analyst and clinical professor of medicine at NYU Langone, previously told Fox News Digital.

Scientists say the unique cell wall structure of C. auris makes it harder to kill. (iStock)

It is also frequently misdiagnosed, delaying treatment and infection control measures.

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“Unfortunately, symptoms such as fever, chills and aches may be ubiquitous, and it can be mistaken for other infections,” Siegel said.

In September, he said intense research was ongoing to develop new treatments.

Only four major classes of antifungal drugs are currently available, and C. auris has already shown resistance to many of them. While three new antifungal drugs have been approved or are in late-stage trials, researchers warn that drug development has struggled to keep pace with the fungus’s evolution.

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Despite the sobering findings, there is still room for cautious optimism.

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The fungus can cling to skin and hospital surfaces, aiding its spread. (iStock)

In separate research published in December, scientists at the University of Exeter in England discovered a potential weakness in C. auris while studying the fungus in a living-host model. 

The team found that, during infection, the fungus activates specific genes to scavenge iron, a nutrient it needs to survive, according to their paper, published in the Nature portfolio journal Communications Biology in December.

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Because iron is essential for the pathogen, researchers believe drugs that block this process could eventually stop infections or even allow existing medications to be repurposed.

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“We think our research may have revealed an Achilles’ heel in this lethal pathogen during active infection,” Dr. Hugh Gifford, a clinical lecturer at the University of Exeter and co-author of the study, said in a statement.

New research is underway to develop better treatments and diagnostics for C. auris. (iStock)

As researchers race to better understand the fungus, officials warn that strict infection control, rapid detection and continued investment in new treatments remain critical.

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Health experts emphasize that C. auris is not a threat to healthy people.

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Fox News Digital has reached out to the CDI researchers and additional experts for comment.

Fox News Digital’s Angelica Stabile contributed reporting.

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Record-breaking flu numbers reported in New York state, sparking warnings from officials

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Record-breaking flu numbers reported in New York state, sparking warnings from officials

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The New York State Department of Health reported a record surge in influenza activity, with 71,123 positive flu cases recorded statewide during the week ending December 20.

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Health officials said the figure represents the highest number of flu cases ever reported in a single week since influenza became a reportable disease in New York in 2004.

State health data show the weekly total reflects a 38% increase from the previous reporting period, signaling a rapidly intensifying flu season.

There have been 189,312 reported positive flu cases so far this season, while influenza-related hospitalizations rose 63% in the most recent week.

FLU BY STATE: WHERE THIS SEASON’S HIGHLY CONTAGIOUS VARIANT IS SPREADING THE MOST

New York reported the highest weekly total of cases ever recorded since influenza became reportable in 2004. (iStock)

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“We are seeing the highest number of flu cases ever recorded in a single week in New York state,” Health Commissioner Dr. James McDonald said in a press release.

There have been 189,312 reported flu cases so far this season, with influenza-related hospitalizations increasing 63% in the most recent week. (iStock)

Earlier this month, the department declared influenza prevalent statewide, a designation that requires unvaccinated health care workers to wear masks in patient care settings.

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Health officials continue to emphasize that vaccination remains the most effective way to prevent severe illness and hospitalization from influenza.

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New Yorkers who have not yet received a seasonal flu shot are still encouraged to do so, with experts saying vaccination can offer protection even later in the season.

Health officials continue to urge New Yorkers to take preventive steps, including vaccination and staying home when sick, to limit further spread. (iStock)

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To help limit further spread, the department advises individuals experiencing flu-like symptoms — including fever, cough, sore throat, or body aches — to stay home. State health officials also recommend frequent handwashing, using hand sanitizer, and avoiding close contact with sick individuals.

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For those who become ill, officials say antiviral medications are available and are most effective when started within 48 hours of symptom onset.

Health officials also added that people at higher risk for complications should contact a health care provider promptly for evaluation and possible treatment.

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The department noted that flu activity typically peaks in January, meaning case counts could continue to climb in the weeks ahead.

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