every carcase shall be sprayed with disinfectant;

carcases (together with any tissue, blood or contaminated material spilled during or immediately following slaughter) removed from the premises for disposal shall be contained in covered, leak-proof containers; and

all parts of the premises which housed susceptible animals, and any parts of buildings and yards and other surfaces which may have been contaminated during or after slaughter, shall be sprayed with disinfectant.