TABLE 1.

Role of CRP and ς^s in the expression of Hap

Straina	Allele	Azocasein units/OD unit	Hemagglutination titer
C6706	crp+	9.36 ± 0.20	64
KSK394	crp	0.28 ± 0.07	>2
C6709-1	rpoS+	7.45 ± 0.30	128
DSM-V491	ΔrpoS	2.07 ± 0.27	64–128

^aThree independent single-colony cultures of each strains were diluted 1,000-fold in 50 ml of TSB and incubated with shaking (200 rpm) at 30°C to an OD₅₉₅ of >4 to ensure complete derepression of Hap in each wild-type strain.