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FILE - This 2002 electron microscope image made available by the Centers for Disease Control and Prevention shows a Listeria monocytogenes bacterium. (Elizabeth White/CDC via AP, File)

FILE - This 2002 electron microscope image made available by the Centers for Disease Control and Prevention shows a Listeria monocytogenes bacterium. (Elizabeth White/CDC via AP, File)

This illustration, of an artistic recreation that was based upon scanning electron microscopic (SEM) imagery, depicts a three-dimensional (3D), computer-generated image of a grouping of Listeria monocytogenes bacteria. (Jennifer Oosthuizen/CDC via AP, File)

This illustration, of an artistic recreation that was based upon scanning electron microscopic (SEM) imagery, depicts a three-dimensional (3D), computer-generated image of a grouping of Listeria monocytogenes bacteria. (Jennifer Oosthuizen/CDC via AP, File)

This image provided by the U.S. Department of Agriculture in July 2024 shows a label for Boar's Head liverwurst. The company recalled 7 million pounds of deli meats on July 30, 2024, expanding an initial recall on July 25 after a liverwurst sample collected in Maryland tested positive for listeria. (USDA via AP)

This image provided by the U.S. Department of Agriculture in July 2024 shows a label for Boar's Head liverwurst. The company recalled 7 million pounds of deli meats on July 30, 2024, expanding an initial recall on July 25 after a liverwurst sample collected in Maryland tested positive for listeria. (USDA via AP)