Autoinoculation is derived from the Latin root words "autos" and "inoculate" that mean "self implanting" or "self infection" or "implanting something from oneself". [1] [2] Autoinoculation can refer to both beneficial medical procedures (e.g. vaccination) as well as non-beneficial or harmful natural processes (e.g. infection or disease). One beneficial autoinoculation medical procedure is when cells are removed from a person's body, medically altered then reinserted ("implanted" or "infected") into the same organism or person again to achieve some diagnostic or treatment aim. [3]