TABLE 3.

Plaque phenotype and lethal dose of S. flexneri strains

Strain	Mutation	Gene responsible for plaque phenotype	Plaque phenotyped	Lethal dose (CFU)
2457T	WTc	NAa	WT	107
SS100	galU2	galU	No plaques	NDb
SSW202	cydC1	cydC	<WT	109
SSW302	pepP1	ubiH	>WT	106
SSW402	ribE1	ribE	>WT	106

^aNA, not applicable. 

^bND, not determined. 

^cWT, wild type. 

^d< and >, smaller and larger than indicated phenotype.