We all know that every story has two sides. This concept is very common in the field of medicine. There are scores of medicines that cure diseases and illness but, they also cause some side effects. Similarly, one of the most popular debates regarding similar concept is associated with a bacterium known as Escherichia coli. Scientists, physicians, philosophers often discuss advantages and disadvantages of Escherichia coli. In this essay, I would be discussing harms and benefits of Escherichia coli.