Table 1.

Heat survival rate^a

Strain	No. of CFU after incubation at:		Survival rate (%)
	37°C	55°C
168	3.2 × 108	2.8 × 108	87.5
BM1889 (HtpX−)	3.5 × 108	3.0 × 108	85.7
BM1574 (FtsH−)	2.3 × 108	1.9 × 108	82.6
BM1892 (FtsH− HtpX−)	9.3 × 107	6.5 × 105	0.7

^aThe genotypes of the strains are listed in Table S1 in the supplemental material. The relevant phenotypes of the strains are given within parentheses. The titers of various strains after incubation at 37 and 55°C on LB agar plates are given as the numbers of CFU. Heat survival assays were performed at least three times with each strain. Representative results are shown.