TABLE 2.

Antimicrobial susceptibility of Shigella spp.

Antimicrobial agent	MIC (μg/ml)
	S. flexneri									S. sonnei		S. dysenteriae
	F1a	F2	F3	F4	F5	F6	F7	F8	F9	S1b	S2	D1c
Ampicillin	>256	>256	1	>256	>256	>256	1.5	1.5	0.5	2	>256	>256
Tetracycline	>256	>256	1	>256	>256	>256	>256	>256	>256	>256	>256	>256
Chloramphenicol	>256	>256	1	>256	>256	>256	2	1	0.75	1.5	3	>256
Co-trimoxazole	>32	>32	0.032	>32	0.38	>32	0.125	>32	0.032	>32	>32	>32
Nalidixic acid	2	4	1.5	1.5	1.5	4	3	2	2	3	4	3
Ciprofloxacin	0.008	0.016	0.006	0.006	0.006	0.008	0.008	0.016	0.016	0.012	0.008	0.012
Ceftazidime	0.094	0.19	0.094	0.094	0.094	0.094	0.064	0.064	0.064	0.094	0.064	0.094
Cefotaxime	0.064	0.125	0.064	0.064	0.064	<0.016	0.094	0.064	0.064	0.064	0.023	0.047
Cefoxitin	2	3	2	2	2	2	2	3	2	1	1	1

^aF₁ to F₉, subgroups of S. flexneri based on antibiogram and plasmid analysis. 

^bS₁ and S₂, subgroups of S. sonnei based on antibiogram and plasmid analysis. 

^cD₁, group of S. dysenteriae.