text: Dog droppings are one of the leading sources of E. coli ( fecal coliforms ) bacterial pollution : One gram of dog feces contains over 20,000,000 E. coli cells .
simplified: The droppings are one of the leading sources of E. coli ( fecal coliforms ) bacterial pollution : one gram of dog feces contains over 20,000,000 E. coli cells .