You may be safer from the flu in a humid room than in a dry one, according to a new study from researchers at the Centers for Disease Control and Prevention.
To simulate flu transmission in a health care setting, the researchers used "coughing" and "breathing" mannequins that were placed about 6 feet apart. Flu virus particles were released during a "cough," and devices throughout the room and near each "breathing" mannequin's mouth captured the particles. The particles were then collected and tested for their ability to infect human cells.
At humidity levels of 23 percent, 70 to 77 percent of the flu virus particles were still able to cause an infection an hour after the coughing simulation. But when humidity levels were raised to 43 percent, just 14 percent of the virus particles had the ability to infect. Most of the flu particles became inactive 15 minutes after they were released into the humid air. "The virus just falls apart," at high humidity levels, said study researcher John Noti, of the CDC's National Institute for Occupational Safety and Health.
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