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Your immune system activates just by seeing sick faces, research shows

Ellsworth Toohey
Jul 29, 2025
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When you see someone who looks sick, your brain doesn't wait for them to get close before sounding the alarm. In fact, just seeing signs of illness from a distance triggers your immune system to gear up for battle, according to a new study from Swiss researchers.

Using virtual reality headsets, scientists showed volun…

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