Health
Researchers locked flu patients in a hotel with healthy adults — no one got sick
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With an aggressive new strain spreading across the country, this year’s flu season has been marked by record-high hospitalizations and reportedly intense symptoms.
As people look for ways to contain the spread, new research has found that a few simple factors can greatly reduce transmission.
Researchers from the University of Maryland Schools of Public Health and Engineering in College Park and the School of Medicine in Baltimore studied influenza spread by placing flu-positive college students in a hotel room with healthy middle-aged adult volunteers.
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The study, published in the journal PLOS Pathogens, is reportedly the first clinical trial investigating how the flu spreads from naturally infected people to uninfected people, according to a press release.
The participants, including 11 healthy volunteers, lived on a quarantined floor of a Baltimore-area hotel for two weeks. During that time, they simulated interactions, including having conversations, doing physical activities like yoga, and passing around objects like pens and tablets from infected people to the rest of the group.
New research has experts questioning how the flu spreads through airborne transmission. (iStock)
Researchers monitored the participant’s symptoms, performed daily nasal swabs, and collected saliva and blood samples to test for antibodies, the release stated.
The study also measured the “viral exposure” in the volunteers’ breathing air and ambient air in the activity room. The exhaled breath of the participants was measured by a machine called the Gesundheit II, invented by researcher Dr. Donald Milton and colleagues at Harvard T.H. Chan School of Public Health.
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At the end of the experiment, none of the healthy individuals had become infected with the flu due to a variety of factors. This included a lack of coughing, as the infected students were holding “a lot of virus in their noses” and only small amounts were “expelled into the air,” the researchers noted.
Researchers said proper ventilation was a major factor in halting flu spread in this study. (iStock)
“Our data suggests key things that increase the likelihood of flu transmission — coughing is a major one,” Dr. Jianyu Lai, post-doctoral research scientist and the study’s lead data analyst and report writer, shared in a statement.
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The other factor was ventilation and air movement, as the air in the study room was “continually mixed rapidly by a heater and dehumidifier, and so the small amounts of virus in the air were diluted,” Lai pointed out.
The researcher added that middle-aged adults are “usually less susceptible” to influenza than younger adults.
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Most researchers assume that airborne transmission is a major factor of disease spread, according to Dr. Donald Milton, professor at SPH’s Department of Global, Environmental and Occupational Health and a global infectious disease aerobiology expert.
“At this time of year, it seems like everyone is catching the flu virus, and yet our study showed no transmission,” he said in the same press release. “What does this say about how flu spreads and how to stop outbreaks?”
There have been 81,000 flu-related hospitalizations and more than 3,000 deaths in the U.S. this year so far, data shows. (iStock)
Milton, who was reportedly among the first experts to identify how to stop the spread of COVID-19, noted that findings from these types of trials are essential to updating international infection-control guidelines.
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“Being up close, face-to-face with other people indoors where the air isn’t moving much, seems to be the most risky thing — and it’s something we all tend to do a lot,” he said.
“At this time of year, it seems like everyone is catching the flu virus, and yet our study showed no transmission.”
“Our results suggest that portable air purifiers that stir up the air, as well as clean it, could be a big help,” Milton suggested. “But if you are really close and someone is coughing, the best way to stay safe is to wear a mask, especially the N95.”
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Approximately 11 million flu illnesses and about 5,000 deaths have occurred so far in the 2025-2026 influenza season, according to CDC data. A large share of the current flu cases are caused by the new influenza A subclade K variant.
Health
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Health
Dementia risk signals could lie in simple blood pressure readings, researchers say
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Simple measurements taken during routine blood pressure checks could predict dementia risk years before symptoms appear.
That’s according to new research presented this week at the American College of Cardiology’s Annual Scientific Session in Louisiana.
The findings draw on two studies led by researchers at Georgetown University, which suggest that monitoring how blood vessels age and stiffen over time can provide a window into future cognitive health.
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Data shows rates of dementia and aging-related cognitive decline are expected to increase as populations age, and half of U.S. adults have high blood pressure (hypertension).
Scientists believe that efforts to better address hypertension, a key contributor to heart disease and a risk factor for dementia, could affect both cardiac and brain health.
Data shows rates of dementia and aging-related cognitive decline are expected to increase as populations age. Meanwhile, half of U.S. adults have high blood pressure. (iStock)
“Blood pressure management isn’t just about preventing heart attacks and strokes; it may also be one of the most actionable strategies for preserving cognitive health,” Dr. Newton Nyirenda, the study’s lead author and an epidemiologist at Georgetown University in Washington, said in a press release.
The research focused on two metrics, the pulse pressure-heart rate index and estimated pulse wave velocity. Both were calculated using data collected during standard doctor visits, such as heart rate, age and blood pressure.
“Blood pressure management isn’t just about preventing heart attacks and strokes; it may also be one of the most actionable strategies for preserving cognitive health.”
Researchers examined five years of data patterns for more than 8,500 people in the SPRINT trial, a large study of adults 50 years and older with hypertension. In the follow-up, 323 of the participants developed probable dementia.
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In one study, the team found the pulse pressure-heart rate index was a strong independent predictor of dementia risk in adults over 50. For participants under 65, every one-unit increase was associated with a 76% higher risk of developing dementia.
For participants under 65, an increase in the pulse pressure-heart rate index was associated with a 76% higher risk of developing dementia. (iStock)
The second study found that adults with consistently elevated or rapidly increasing pulse wave velocity were more likely to develop dementia than those with stable velocity, even after accounting for factors like smoking, gender and cardiovascular history.
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“Our findings suggest that vascular aging patterns may provide meaningful insight into future dementia risk,” said Nyirenda. “This reinforces the idea that managing vascular health earlier in life may influence long-term brain health.”
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The team emphasized that clinicians should tailor risk assessments and treatment strategies to the individual.
Further studies are needed to confirm these parameters and determine whether changing vascular aging trajectories reduces dementia risk. (iStock)
“You don’t want to wait until a patient starts manifesting cognitive decline before you act,” said senior study author Sula Mazimba, an associate professor at the University of Virginia.
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Researchers noted the study could not establish causation. Other limitations included the fact that participants already had hypertension and elevated cardiovascular risk, meaning the findings may not apply to people without those conditions.
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Further studies are needed to confirm these findings and to determine whether improving blood vessel health over time could reduce dementia risk.
Health
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