The incubated composite media or equivalent shall be examined and the findings recorded, discarding cultures which are obviously not Salmonella. Slide serological tests shall be performed using Salmonella polyvalent “O” and polyvalent “H” (phase 1 and 2) agglutinating sera on selected suspect colonies collected from the nutrient agar or MacConkey agar plates. If reactions occur with one or both sera, a subculture of the colonies shall be sent to one of the Department’s laboratories at either Agriculture, Food and Environmental Science Division, Newforge Lane, Belfast, BT9 5PX, or Veterinary Science Division, Stoney Road, Belfast, BT4 3SD, for further typing.