A vessel for the heat treatment of pathogenic liquids in batches that is intended to be filled to a predetermined level while leaving a compression dome, wherein it comprises at least one pressurized steam injector positioned so as to immerse in the liquid contaminated by pathogenic agents when the heat treatment vessel is filled to the predetermined level with the liquid contaminated by pathogenic agents and pointed toward the inside of the heat treatment vessel, with at least one tangential component so as to heat the liquid to be decontaminated and to create a cyclonic movement of the liquid contaminated by pathogenic agents to be decontaminated in order to make it possible to homogenize the temperature of the liquid to be decontaminated without a movable mechanical element.