Table 1. Bacterial strains used in this study.

Strain/Plasmid	Description (Country of origin)	Reference
H10407	LT, ST, CFA/I (Bangladesh)	[47]
H10407Kan	H10407 CFA/I- (cfaE::KmR)	[21]
CVD30	ST, CFA/I, CS21 (504239, India)	[10]
EMS07	CVD30ΔcfaB	This study
EMS08	CVD30ΔlngA	This study
EMS09	CVD30ΔcfaBΔlngA	This study
EMS10	CVD30ΔcfaB(pGA2-CFA/I)	This study
EMS11	CVD30ΔcfaBΔlngA(pGA2-CFA/I)	This study
E9034A	LT, ST, CS21, CS3	[48]
E. coli pGA2-CFA/I	High level constitutive CFA/I expression	[49]
10002a	ST, CFA/I, CS21 (Chile)	[50]
100386	ST, CFA/I, CS21 (The Gambia)	[10]
102658	ST, CFA/I, CS21 (The Gambia)	[10]
200332	ST, CFA/I, CS21 (Mali)	[10]
204033	ST, CFA/I, CS21 (Mali)	[10]
300202	ST, CFA/I, CS21 (Mozambique)	[10]
302005	ST, CFA/I, CS21 (Mozambique)	[10]
401248	ST, CFA/I, CS21 (Kenya)	[10]
600609	ST, CFA/I, CS21 (Bangladesh)	[10]
702213	ST, CFA/I, CS21 (Pakistan)	[10]
702375	ST, CFA/I, CS21 (Pakistan)	[10]