*Researchers recently conducted a small experiment to better understand how flu spreads in real-world settings.
As Women’sHealth reports, five participants infected with influenza spent two weeks alongside 11 healthy adults in a hotel setting. The participants engaged in everyday activities, including casual conversations, and shared objects such as pens and tablets. Despite these close interactions, none of the healthy participants contracted the flu.
“Our objective in this study wasn’t to prevent the flu,” said Donald Milton, MD, co-author and professor at the University of Maryland School of Public Health. “We were trying to understand how transmission happens so that we could design better ways to prevent it happening.”
Experts believe several factors contributed to the lack of transmission. Most participants were middle-aged adults who may have developed immunity from prior flu exposure. Additionally, the study took place during a mild flu season (2023-2024), and many infected participants did not cough frequently. “Flu cases where people are coughing are the most contagious,” Milton explained.
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The study also revealed the role of airflow. Even with limited ventilation, the room’s air circulation kept viral particles diluted. “The better airflow is, the less likely that viral particles in the air land on another individual,” Milton said.
Medical specialists suggest practical steps to reduce flu risk. Amesh A. Adalja, MD, from Johns Hopkins, emphasized, “Cough is a major mechanism by which viral particles spread through the air. Diminishing coughing, diminishes that opportunity for respiratory viruses to spread.”
Thomas Russo, MD, of the University at Buffalo, recommended using air filters when windows cannot be opened, and noted that fans can also improve air circulation. Wearing an N95 mask remains highly effective, especially near people who are coughing.
“Ultimately, all of these layers of protection work—that’s what this shows,” Milton said of the study.
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