TABLE 2.

Distribution of resistance patterns in S. flexneri and S. sonnei

No. of antibiotics	Drug resistance patterna,b	No. of isolatesb
		S. sonnei		S. flexneri
		1986–1987	1994–1995	1986–1987	1994–1995
1–3	Total	19	21	23	5
4	A AC C T	1		14
	C T TM SX	1			2
	Other patternsc	3		1	1
	Total	5	0	15	3
5	A AC C T TM				12
	A AC C T SX	1		8	1
	Other patterns			4	4
	Total	1	0	12	17
6	A AC PI C T TM				4
	A AC PI T TM SX		5	1
	A AC C T TM SX			1	7
	A AC NX C T TM				3
	Other patterns	1	2	4	1
	Total	1	7	6	15
7	A AC PI C T TM SX		1	1	2
	A AC NX C T TM SX				44
	Other patterns	1		1	1
	Total	1	1	2	47
8	A AC PI NX C T TM SX				4
	Other patterns	2		2	1
	Total	2	0	2	5
9–10	A AC PI G NT C T TM SX	3		1
	Other patterns		1		1
	Total	3	1	1	1
Totald		32	30	61	93

^aDrug resistance abbreviations: A, ampicillin; AC, amoxicillin-clavulanic acid; C, chloramphenicol; T, tetracycline; TM, trimethoprim; SX, sulfamethoxazole; PI, piperacillin; NX, nalidixic acid; G, gentamicin; NT, netilmicin. 

^bThe total number of isolates in each category is shown in boldface type. 

^cOther patterns, resistance patterns shown by one strain of the period studied. 

^dTotal (shown in boldface type) of all the totals for individual categories; excludes 15 fully sensitive strains.