Table 1. Bacterial strains used in this study.

Strain	Characteristic(s)	Reference or source
O395	O1 classical Ogawa, Smr*	Taylor et al. (1987)
CVD112	O139	Laboratory collection
MBN142	CG842 ΔtoxT/tcpA–lacZ	Nye et al. (2000)
MBN135	CG842 tcpA–lacZ	Nye et al. (2000)
SJK166	O395 promoter of ToxT–GFP	Nancy Beck†
SJK174	O395 ΔtoxR, promoter of ToxT–GFP	Nancy Beck

^*Streptomycin resistant.

^†University of Michigan Medical School.