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    Bacteria are present in the feces of the patient. From feces, it may transmit to the food by using sewage water. Sewage contamination in food leads to the contamination of foods. The sewage contaminations are due to pipe leakage and mixing of sewage water with the food. The food that involves the transmission of bacteria in raw or undercooked meat, poultry, eggs or egg products. Bacteria enter into the stomach and then go into the intestine. Salmonella is intracellular pathogen. In intestine, it adheres to enterocyte and invades in the cell. Bacteria increase adenylate cyclase activity. This increases the cAMP level of the intestine that leads to diarrhea. The inflammation of intestine starts when cell lysis occurs. This inflammation is called gastroenteritis. From intestine, it adheres to the blood vessel and causes bacteremia. Bacteria affect many organs when it enters the blood.

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