TABLE 1.

C. perfringens spore heat resistance and water content^a

Strain	CPEb	D value at 90°C (min)	Density (g/ml)	% Waterc
NCTC 8239	+	120.6 ± 4.5	1.329 ± 0.006	51.6 ± 2.4
NCTC 8679	+	45.6 ± 9.4	1.333 ± 0.008	50.0 ± 3.2
SM101	+	21.4 ± 0.8	1.308 ± 0.004	59.8 ± 1.6
NCTC 10240	+	19.9 ± 2.4	1.308 ± 0.006	59.8 ± 2.4
3663	+	19.0 ± 2.1	1.306 ± 0.010	60.6 ± 3.9
FD1	−	12.5 ± 4.6	1.307 ± 0.006	60.2 ± 2.4
T-65	−	10.1 ± 1.6	1.316 ± 0.006	56.7 ± 2.4
ATCC 3624	−	6.9 ± 0.7	1.322 ± 0.005	54.3 ± 2.0
13V1	−	5.5 ± 1.6	1.296 ± 0.006	64.6 ± 2.4

^aAll values are averages ± SDs of at least three determinations using independent spore preparations.

^b+, present; −, absent.

^cWater content was determined using the formula density = −0.00254x − 1.460 (22) and is expressed as a percentage of the wet mass.