Growth Limiting pH, Water Activity, and Temperature for Neurotoxigenic Strains of Clostridium butyricum

Table 2

Limiting water activities and temperatures for growth of Clostridium butyricum in acidified PYGS broth.

Limiting factor	Nontoxigenic C. butyricum cocktail	C. butyricum ATCC 43181	C. butyricum ATCC 43755
𝑎𝑤 (NaCl)	0.96 (3/15)^a	0.96 (6/9)	0.96 (2/12)
𝑎𝑤 (Sucrose)	0.95 (6/12)	0.96 (8/9)	0.96 (4/6)
Temperature	8	10	11

aNumber of tubes positive within 42 days of incubation out of total inoculated at stated water activity.