Age of Orion
Those who have become host to the worms and have fallen under their sway, become drones. They look normal, but under medical inspection, the worms can be seen around spine, usually close to the neck and base of the skull.
Drones become one of two things, worm food, or a Shaper turns them into a higher form of Annelid life, including Midwife, Reaver, or Shapers. Other higher forms may exist, but no record of them have ever been made.