TABLE 2.

Sporulation of ssp mutants

Strain	Relevant genotype	CFU ml−1a	% Sporesb
DK1622	Wild type	7.62 × 106	100
HK1126	ssp5	7.03 × 106	92.3
HK1130	ssp9	<102	<0.001
HK1131	ssp10	4.73 × 102	0.006
HK1132	ssp11	1.52 × 103	0.02

^aThe number of heat- and sonication-resistant viable spores was calculated from the number of CFU per milliliter assayed after 7 days of development. The values presented are from one representative experiment. Each experiment was repeated at least three times, and the standard error from these independent experiments was between 10 and 50%. 

^bReported as a percentage of wild-type parent strain spore levels.