The invention relates to a cooking oven (1), having a cavity (2) which is closable by a door (3). To reduce bacteria growth the invention is characterized in that oxygenating gas or ozone generating means (4) are provided for supplying at least a part of the cavity (2) or a region (5) adjacent to the cavity (2) with oxygenating gas or ozone, wherein the oxygenating gas or ozone generating means (4) are arranged at or in a wall (6) of the cavity (2). A container or bag (11) is arranged in the cavity (2) for receiving the oxygenating gas or ozone produced by the oxygenating gas or ozone generating means (4).
