Salmonella: Trickier Than We Imagined

Salmonella is serving up a surprise not only for tomato lovers around the country but also for scientists who study the rod-shaped bacterium that causes misery for millions of people. Researchers have identified a molecular trick that may explain part of the bacteria's fierceness: A protein allows the bacteria to maintain a low profile in the body, giving Salmonella crucial time to gain a foothold before the immune system is roused to fight the invader.

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