Plague Doctors are a common sight on the touchlines amongst the sideline staff of Nurgle-aligned teams, and are well-versed in the virulent strains that infect their players and how best to deal with them when necessary.
Once per game, a team that has purchased a Plague Doctor can use them to re-roll a failed Regeneration Roll for one of their players. Alternatively, a team that has purchased a Plague Doctor can use them in the same manner as an Apothecary.