👉 Listeria is a bacteria that can cause serious illness in humans. It is commonly found in contaminated meat, poultry, and dairy products. Symptoms of Listeria infection include fever, chills, body aches, nausea, vomiting, diarrhea, headache, and fatigue. Treatment for Listeria infection usually involves antibiotics, such as azithromycin or doxycycline, which can help fight the bacteria. It is important to avoid consuming contaminated meat and dairy products to prevent the