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2. Nausea

Nausea is the first and most common symptom of salmonella infection. The body starts fighting infections as soon as it identifies harmful bacteria. Stomach acid production increases to kill the bacteria. The immune system sends phagocytes to attack the invading bacteria as well. These processes occur in the stomach and digestive tract and cause nausea.

Understanding Salmonella: A Guide to its 10 Symptoms skynesher / Getty Images

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