Scientists want to make a chink in the armor of a bacterium that has little name recognition yet is the number-one bacterial cause of the diarrhea, vomiting and stomach pain Americans experience annually. While Salmonella is likely quicker to sound an alarm, infection with Campylobacter jejuni is at least 25 times more common. Americans report about 42,000 cases of Salmonella sickness each year compared with approximately 1.3 million cases of Campylobacter infection, according to the Centers for Disease Control and Prevention.

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