Gastrointestinal infections are illnesses caused by harmful microorganisms, such as bacteria, viruses, or parasites, that affect the digestive system. Common symptoms include diarrhea, vomiting, stomach cramps, and fever. These infections can be contracted through contaminated food or water, or by close contact with an infected person. Preventing gastrointestinal infections involves practicing good hygiene, such as washing hands regularly and ensuring food is cooked properly. Common pathogens responsible for these infections include Salmonella, E. coli, and Norovirus. Treatment often focuses on hydration and, in some cases, antibiotics may be necessary to combat bacterial infections.