“…Spore suspension of Clostridium botulinum type C, Strain FH 6513 This strain, supplied by Dr T. A. Roberts, Meat Research Institute, Langford, Bristol, was isolated originally by Dr R. J. Gilbert, Food Hygiene Laboratory, Public Health Laboratory Service, Colindale, London. Its isolation, properties and storage, and the method of preparing spore suspensions were described by Graham & Smith (1977). The spore suspension was diluted in gelatin phosphate buffer (pH 6.6) to give a viable count of 3000 spores/ml; it was dispensed in 2 ml aliquots and stored at -20 "C. As required, one aliquot was thawed and diluted to contain 300 spores/ml.…”