TABLE 3.

Comparison of LD₅₀ of botulinum toxins produced at 30 and 37°C by C. botulinum strain 93-197

Dilution	No. of mice alive/no. tested after incubation of culture at:
	30°C	37°C
1:1,280	0/2	0/2
1:2,560	0/2	0/2
1:5,120	1/2a	0/2
1:10,240	2/2	0/2
1:20,480	2/2	1/2b
1:40,960	2/2	2/2

^aThe LD₅₀ of type F toxin was 1:5,120 at 30°C; at this dilution and temperature, the LD₅₀ of type B toxin was <1.

^bThe LD₅₀ of type B toxin was 1:20,480 at 37°C; at this dilution and temperature, the LD₅₀ of type F toxin was <1.