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.

[Read more…]

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.

[Read more…]

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.

[Read more…]

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.

[Read more…]

COVID-19 vaccines saved 2.5 million lives in four years. They are among the most effective public health tools ever developed. Like undeserved heroes, vaccines protect even amid widespread scandal and misinformation.

Vaccine skepticism continues spreading across social media and online spaces. Some rumors claim COVID-19 vaccines cause serious long-term health harm. Current scientific consensus does not support those claims.

However, a new large study from France reveals strong benefits and no harm from COVID-19 mRNA vaccines. The national cohort study found no increase in all-cause mortality. Adults received COVID-19 vaccines up to four years earlier.

Vaccination reduced death from severe COVID-19 by 74%. The study also found a 25% percent reduction in all-cause mortality.

Results were published in JAMA Network Open.

[Read more…]

Fever acts like a locked vault that traps and destroys invaders. When pathogens enter, body temperature rises to eliminate threats. This defense mechanism evolved over millions of years. It remains one of the immune system’s first responses.

A newly discovered bird flu gene helps viruses survive fever. This finding raises serious concern among infectious disease scientists. If bird flu adapts for human transmission, fever may fail. That failure could dramatically worsen future pandemics.

Normal fevers usually stop human influenza viruses effectively. Bird flu viruses continue spreading despite elevated body temperatures. Fever normally shuts down viral replication. Bird flu appears able to resist this defense.

[Read more…]

Long COVID has few obvious links to other infectious diseases like tuberculosis. Yet, new research suggests hidden infections may activate alongside COVID-19. Viruses like Epstein-Barr could re-emerge as COVID-19 stresses immunity. This compound effect may explain fatigue, brain fog, and other Long COVID symptoms.

The study’s findings suggest coinfections may contribute to Long COVID development. These infections may exist before or emerge during COVID-19 infection. Their interaction with the immune system could drive persistent symptoms. This connection offers a new framework for understanding Long COVID mechanisms.

The study was published in eLife and led by 17 researchers. Many researchers involved were affiliated with Rutgers Health.

[Read more…]

Climate change expands tick ranges, so disease risks increase for everyone. Ticks spread several spotted fevers like Rocky Mountain spotted fever and rickettsial pox. These diseases all come from bacteria within the rickettsia genus. Rising tick movement now raises new concerns for animal and human health.

A new spotted fever organism recently killed multiple dogs in the United States. Researchers are watching this bacterium closely to prevent possible human transmission. Many rickettsia relatives can infect humans with serious disease. Experts say they should always be treated as potentially harmful.

North Carolina State University scientists cultured this new rickettsia bacterium from a sick dog. The dog showed symptoms similar to Rocky Mountain spotted fever infections. Sequencing revealed an entirely new species within the rickettsia lineage. Researchers named it Rickettsia finnyi after Finny, the infected dog.

An author of the study, Barbara Corollo, said this species first appeared in 2020. That early cluster involved three dogs with similar severe symptoms. She said 16 more dog samples have since tested positive. Most infections occurred across southeastern and midwestern states.

[Read more…]

The fall of Constantinople bears similarity to a surprising microscopic discovery. In some accounts, the Ottoman conquest succeeded when one gate was left open. That small mistake allowed invaders to enter the once-impregnable city. Some historians note the conquest may have hinged on that doorway.

Scientists see a similar pattern in recent flu research. High-resolution imaging shows flu viruses entering human cells in real time. These images reveal cells do not passively wait for infection. Instead, they sometimes help guide the virus inside.

Researchers from Switzerland and Japan built a bespoke microscopy system. Their tool zooms closely on the cell’s outer membrane in a dish. This system helps scientists watch flu viruses penetrate living cells. The work captures infection processes at extremely high resolution.

The results surprised the research team studying cell behavior. Cells did not remain dormant when the virus approached them. Instead, each cell seemed to reach out and actively grab the virus. Lead researcher Yohei Yamauchi described this moment as a “dance” between virus and cell.

[Read more…]

Common vaccines may help protect the aging brain. Recent studies found that shingles and RSV vaccines could lower dementia risk. A new study offers even stronger evidence supporting shingles vaccine dementia protection. These findings suggest that vaccines may offer a promising path for preventing the disease.

What Makes the Recent Findings Significant?

Research in NPJ Vaccines examined Shingrix and Arexvy, two vaccines that protect against shingles and RSV. The study found that both vaccines may also help reduce dementia risk. The researchers traced these protective effects to an immune-boosting adjuvant called AS01.

The study reported strong benefits for vaccinated people. Those who received the shingles vaccine showed an 18% lower dementia risk. The researchers believe AS01 plays a key role in strengthening immune memory. This connection may help protect the brain during aging.

However, the researchers noted major study limitations. People who choose vaccines are often healthier overall than those who decline. They may eat better diets and engage in more physical activity. These lifestyle factors strongly influence dementia risk, but rarely show up in medical records.

These hidden factors can create important confounding variables. They can make vaccines appear more protective than they actually are. Researchers needed a way to separate vaccine effects from everyday habits. That required a study design closer to a randomized controlled trial.

[Read more…]