Listeria (Listeriosis)

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Learn more about an outbreak of Listeria in hard-boiled eggs

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Get answers to commonly asked questions about Listeria

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Listeria information en español

PulseNet Helps Detect Listeria Food Poisoning

Learn how CDC’s Listeria Whole Genome Sequencing Project is improving food safety

Listeriosis is a serious infection usually caused by eating food contaminated with the bacterium Listeria monocytogenes. An estimated 1,600 people get listeriosis each year, and about 260 die. The infection is most likely to sicken pregnant women and their newborns, adults aged 65 or older, and people with weakened immune systems.