One of the most difficult challenges with COVID-19 is constant viral evolution. As the virus mutates and infects animals, tracking its changes becomes harder. Current vaccines remain the strongest defense against severe COVID-19 disease. Still, improved vaccine technologies are urgently needed as variants continue emerging.

Researchers recently tested a single-dose intranasal COVID-19 vaccine in animals. They found it effectively prevented coronavirus infection and blocked viral transmission. The research team comes from the University of Hong Kong’s LKS Faculty of Medicine. Their work focuses on preventing future coronavirus outbreaks before they spread.

This new vaccine functions like a Swiss Army knife against coronaviruses. Most existing vaccines primarily protect against one dominant viral strain. This prototype offers broad protection and requires only a single dose.

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Researchers have identified powerful immune defenders operating inside the human gut. These defenders act like a football team’s defensive linebackers. They block harmful microbes and chase invaders that breach defenses.

One key defender is a gut protein called intelectin-2. Intelectin-2 reinforces mucus walls and captures invading bacteria. Together, these actions stop infections before they spread deeper.

Intelectin-2 is not working alone inside the mucus layer. Mucus contains many immune proteins that block dangerous microbes. These proteins prevent infections and limit harmful inflammation.

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Viruses and bacteria have been locked in an ancient war for billions of years. Like human warfare, survival depends on constant adaptation and innovation.

Scientists now have a way to watch this microscopic arms race unfold in space. By moving the battlefield, researchers are gaining new insight into how microbes fight, survive, and evolve.

A new study published in PLOS Biology examined bacterial and viral evolution aboard the International Space Station. Researchers focused on Escherichia coli and a virus known as the T7 bacteriophage. Phages are viruses that infect bacteria, hijacking their machinery to reproduce. Phage therapy is already being explored as a way to kill antibiotic-resistant bacteria.

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Auto-Brewery Syndrome sounds fictional, but it is a real medical condition. The rare illness causes people to feel drunk after eating normal foods. This intoxication can happen even when no alcohol is consumed.

The disease, often shortened to ABS, remains poorly understood. Many people live with symptoms for years without diagnosis or treatment. Overall awareness among clinicians and the public remains very limited.

A new study reinforced and expanded previous findings on ABS. Researchers analyzed stool samples from 22 people with confirmed ABS. They compared results with symptom-free household partners.

The study found excessive ethanol production in affected individuals’ stool. Two bacteria appeared consistently across ABS samples, Klebsiella pneumoniae and Escherichia coli.

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Sometimes it is easy to refer to “the pandemic” as something that already ended. The phrase alone can make COVID-19 seem historical. While the World Health Organization ended COVID-19’s designation as a global health emergency in 2023, the disease itself has not stopped exacting a heavy toll.

A recent study published in JAMA Internal Medicine examined COVID-19 illnesses, hospitalizations, and deaths in the United States from late 2022 through late 2024. The findings make clear that COVID-19 continues to impose a significant health burden year after year.

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When professional football teams prepare for matches, they study opponents carefully. Studying structure and strategy helps sports teams identify weaknesses in their rivals that they can exploit. Researchers used a similar process to study the dangerous fungus Candida auris. This deadly fungus has repeatedly shut down hospital intensive care units worldwide.

C. auris resists nearly all known antifungal medications used in hospitals. Finding a biological weakness could allow new therapies or repurposed drugs. Such treatments could finally help clinicians control this dangerous infection.

C. auris spreads easily and is almost impossible to eradicate. The fungus poses the greatest risk to people already critically ill. For this reason, hospital outbreaks have become disturbingly common.

The fungus can live quietly on human skin without immediate symptoms. Infections often spread through ventilators and other invasive medical equipment. Roughly 45% of infected patients eventually die from complications.

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Flu activity surged in December 2025 and January 2026 during heavy holiday travel and celebrations. The increase appears in the latest data from the Centers for Disease Control and Prevention. CDC officials say flu transmission often accelerates during crowded winter gatherings.

The CDC reports at least 11 million illnesses this flu season. Hospitalizations reached 120,000 and fatalities climbed to 5,000 nationwide. These figures reflect surveillance data collected through December 27, 2025.

Health officials warn flu activity will continue rising as winter progresses. Experts say seasonal peaks tend to arrive after major holidays and travel periods. This trend raises concern for hospitals already facing staffing and capacity pressures.

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Disease resurgence is tragic in a society centuries into medical progress. These comebacks become even more tragic when driven by misinformation.

Measles cases in the United States have reached 2,012, CDC reports show. Updated counts appeared in late January as Arizona outbreaks continued spreading. South Carolina outbreaks also expanded during the same reporting period. Three additional states issued warnings about possible measles transmission at airports.

The United States recorded 54 new measles cases in recent updates. The nation now wobbles near losing its measles elimination status. This measles-free designation was first achieved nationally in the year 2000.

Public health officials warn elimination loss could occur in coming months. Loss of elimination status may also occur over years. Total measles cases in 2025 were the highest since 1992. That year, health officials identified approximately 2,200 measles cases nationwide.

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Dengue is one of the world’s most widespread mosquito-borne viral diseases. It causes millions of infections every year worldwide. Nearly half the global population remains at risk today. Climate change continues expanding mosquito habitats, worsening global dengue transmission.

Some people infected with dengue never develop symptoms. Researchers believe these individuals hold clues for better dengue treatments. Their immune systems clear the virus without causing illness. For years, these cases were difficult to study directly.

New research published in Science Translational Medicine changed that. The study provided the clearest look yet at asymptomatic dengue infections. Researchers created a high-resolution single-cell immune map of silent cases. This offered rare insight into immune responses that defeat dengue safely.

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Aging becomes obvious on holiday mornings as energy fades quickly. Children wake buzzing with excitement, while adults need several coffees. This same aging pattern appears inside the immune system. Key immune signals decline over time, but scientists discovered a workaround.

As people age, the thymus produces fewer immune system signals. Scientists found liver cells can temporarily replace these missing signals. With proper factors, liver cells support T-cell development. This process makes the immune system behave more youthfully.

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