Abstract: Non-thermal plasma is a partly ionized gas, which can be generated by a high-voltage electric field at a low pressure. Disclosed herein are apparatuses and methods for treating an enteric disease in vivo using non-thermal plasma. The disclosed apparatuses have a first conduit comprising a lumen and a tip; a first electrode disposed within the lumen of the first conduit; a second electrode comprised of a metal conduit disposed within the first conduit; an insulator disposed within the lumen of the first conduit, the insulator configured to electrically insulate the first electrode from the second electrode; and a gas channel disposed between the outer surface of the metal conduit and the inner surface of the first conduit, the gas channel being capable of feeding a gas from a gas source to the tip, wherein when the potential is applied, the gas is ionized to produce the non-thermal plasma.