TABLE 1.

Strains and cell lines used in this study

Strain or cell line	Description or intestinal segment	Source or reference
S. flexneri strains
WT	S. flexneri serotype 2a strain 2457T	Walter Reed Institute of Research
CFS100	2457T lacking the virulence plasmid	81
Human intestinal enteroid lines
C103	Colon	Baylor College of Medicine
D103	Duodenum	Baylor College of Medicine
I103	Ileum	Baylor College of Medicine
CD7517	Colon	H. J. Kim
TEVS	Colon	N. F. Shroyer