Diarrhea, vomiting, muscle aches, fatigue, headaches, and nausea are some of the common symptoms of this infection. Common signs are itching in the anal and vaginal region (in girls), along with pain in the abdomen, disturbed sleep, weight loss, and poor appetite.The scratching can lead to secondary infections.hen the intestinal infection is caused by bacteria, it is termed as a bacterial intestinal infection or bacterial gastroenteritis. The pathogenic bacteria invades the intestines and causes inflammation. It enters the human body through the intake of contaminated food, water, and undercooked meat.