Escherichia coli (E. coli) infection is caused by a type of bacteria commonly found in the intestines of humans and animals. While most strains are harmless, some can lead to serious illness, often through contaminated food or water. Symptoms may include stomach cramps, diarrhea, and vomiting, typically appearing within a few days of exposure. In severe cases, E. coli infection can lead to complications such as kidney failure, particularly in vulnerable populations like young children and the elderly. Prevention includes practicing good hygiene, cooking meat thoroughly, and avoiding unpasteurized dairy products and untreated water.