People usually get it by eating food or drinking water that has been contaminated, especially things like raw eggs, undercooked chicken, or unwashed fruits and vegetables. Small children, older adults, and anyone with a weak immune system are more likely to get really sick from it. When someone is infected, they might experience symptoms like stomach pain, diarrhea, fever, and sometimes nausea or vomiting. You can help prevent getting sick by washing your hands, keeping raw meat away from other foods, and making sure everything is cooked properly. In many cases, people get better on their own, but if symptoms are severe, doctors may give antibiotics and fluids to treat the infection.