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American Focus > Blog > Tech and Science > Differences in Our Mouth Spray Could Contribute to Infection ‘Super Spreaders’ : ScienceAlert
Tech and Science

Differences in Our Mouth Spray Could Contribute to Infection ‘Super Spreaders’ : ScienceAlert

Last updated: April 21, 2025 5:49 am
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Differences in Our Mouth Spray Could Contribute to Infection ‘Super Spreaders’ : ScienceAlert
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Researchers have conducted new experiments to determine how far spit droplets travel when individuals talk, cough, and breathe, with and without masks. The study, conducted in France, involved 23 volunteers who were observed using an Interferometric Laser Imaging for Droplet Sizing (ILIDS) technique. This method uses a high-speed camera to capture the size and speed of droplets passing through laser light.

The researchers found that speaking and coughing produced droplets ranging from 2 to 60 micrometers (μm) in size, while normal breathing produced droplets between 2 and 8 μm. Coughing expelled droplets at a faster rate and in higher concentrations compared to speaking or breathing. It was also discovered that wearing tissue or surgical masks blocked between 74 and 86 percent of droplets across all types of exhalations.

Interestingly, there was variability in droplet size and velocity among volunteers, indicating the presence of superspreaders – individuals who are more likely to spread infections. This variability was observed not only between different volunteers but also within repeated tests by the same volunteer.

The data collected from these experiments is crucial for understanding how infections spread and developing effective strategies to mitigate transmission. The researchers plan to expand their study to include a larger sample of volunteers to assess variability related to different emissions and the effectiveness of protective measures such as mask-wearing.

This groundbreaking research has been published in Physical Review Fluids, providing valuable insights for future studies on disease transmission and prevention. By understanding how droplets behave and spread, we can better protect public health and combat the challenges posed by infectious diseases.

See also  A Game-Changing Telescope Is About to Drop First Pics. Here's How to Watch. : ScienceAlert
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