Codex: Eye of Terror (2003), p13 — Betrayal on Cadia

As Ursarkar Creed fought on the bloody fields of Kasr Tyrok, the most trusted advisor to the Governor Secundus collapsed deep inside the fortress of Kasr Vazan, his body bloating and rotting in a manner all too familiar to the chirurgeons of the Cadian Sector. The Kasrkin reacted with admirable speed, but it was too late for the troopers of Kasr Vazan and within an hour, the entire fortress was declared Unclean and sealed forever.