From the Poxwalker blurb in the Death guard codex;
"Yet Nurgles rot is but one of the diseases that churn within the innards of the Death Guard, and they saturate every world upon which they tread. The Destroyer Plague- that which tormented Mortarions sons and delivered them to Nurgle- still lurks in their rotting flesh. The zombie plague, the malady of unliving abomination for which Typhus the Herald is the vector primoria, has variegated into countless strains since the Great Rift yawned wide. The Weeping, Mutterflux, the Slithering Scourge and countless others spread before the Death Guard, and it is a cocktail of these appalling maladies that breeds the Walking Pox."
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