Listeriosis is an infection caused by the bacterium Listeria monocytogenes. It is often linked to contaminated food, particularly ready-to-eat meats, unpasteurized dairy products, and certain fruits and vegetables. Symptoms can include fever, muscle aches, and gastrointestinal issues. In severe cases, it can lead to complications such as meningitis or septicemia. Pregnant women, newborns, the elderly, and individuals with weakened immune systems are at higher risk for severe illness from listeriosis. To prevent infection, it is important to practice safe food handling, cook foods thoroughly, and avoid high-risk foods. Early diagnosis and treatment are crucial for effective management.