The most common virus is the common cold, which is actually caused by several different families of viruses. Even though you may experience upper-respiratory symptoms associated with a bacterial infection, most cases of the common cold are not caused by bacteria-which make antibiotics useless against them.
Colon infection is caused when harmful bacteria resides in the colon. Normally, human immune system kills the harmful bacteria but there are some strains of bacteria that grow uninterruptedly even with strong immune system. When such bacteria overgrow in the large intestine, they can cause lot of complication.
Problems such as colon perforation could happen. For those unfamiliar with the term, this occurs when a hole develops in the stomach, small intestines, large bowel, or gallbladder. These holes develop for different reasons. Based on expert findings, here are its major causes: 1  Crohnâs disease. 2  Diverticulitis. 3  Abdominal Injury. 4  Inflammatory bowel disease. 5  Ulcerative colitis.