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Researchers have to visit people who are reported sick, test them to make sure they were infected by the specific strain being investigated, and then question them intensively about what they ate or drank days and weeks before.

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    This undated microscope image provided by the National Institutes of Health shows human colon cancer cells with the cell nuclei stained red. According to new American Cancer Society guidelines released on Wednesday, May 30, 2018, most U.S. adults should begin getting screened for colon cancer when they turn 45. (NCI Center for Cancer Research/NIH via AP)
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    By Herald-Whig .
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