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Immunity's Eyes

Biologists reveal the proteins that first see dangerous microbes

About 3 weeks after a 4-year-old boy visited the emergency room for a nagging eye infection–which doctors easily cured–the boy's mother arrived at the same Canadian hospital. She was infected with the same bacterium, though it had done much more than redden her eyes. She showed signs of shock: plummeting blood pressure and a racing heart.

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