On Nov. 5, 2014, The Poison Control Center at The Children’s Hospital of Philadelphia and Einstein Healthcare Network hosted a city-wide Medical Toxicology Day. 

The old saying goes: "Leaves of three, let them be." Poison ivy, oak and sumac are three plants that carry the same poison — urushiol, a colorless, odorless oil that causes an itchy, irritating rash in almost everyone who comes in contact with it.