Table 1.

Strains used in this study

Strain	Relevant genotype	Ref.
E. coli
CA 46	Produces salmochelin and microcins M  and H47 (formerly called colicin G)	11
K-12 H1443	aroB	18
K-12 H1876	aroB cir fiu∷Mud1X fepA∷Tn10	18

S. enterica
Typhimurium LT2	Lab collection
Paratyphi B IHS 1319	B. Stocker
Stanleyville207/81	8
WR1359 as 207/81 but iroN∷pGP704	This work
WR1361 as 207/81 but cir∷MudJ	This work
WR1363 as 207/81 but iroN∷pGP704 cir∷MudJ	This work
WR1366 as 207/81 but iroN∷pGP704 fepA∷Tn10	This work
WR1367 as 207/81 but cir∷MudJ fepA∷Tn10	This work
WR1368 as 207/81 but iroN∷pGP704 cir∷MudJ                    fepA∷Tn10	This work
ATCC14028, serotype Typhimurium	4, 5
AIR49 as 14028 but aroA∷Tn10 iroBC∷kan	4, 5
AIR50 as 14028 but aroA∷Tn10 iroD∷kan	A. Bäumler
H5546 as AIR49 but aroA+iroBC∷kan	This work
H5547 as AIR50 but aroA+iroD∷kan	This work