TABLE 1.

Characteristics of 33 C. diphtheriae strains from five states isolated between 1973 and 1996

Ribotype	RAPD pattern	Strain designation	Yr of isolation	State of isolation	Biotypea	Toxigenicity		SSCP type		ET
						Elek assay	PCR	Region 6	Region 8
M7a	1	C5214	1973	S.Dak.	M	−	−			216
	2	G4219	1978	Alaska	M	+	+	1	2	35
	2	G4220	1978	Alaska	M	+	+	1	2	35
M11a	3	E8277	1980	S.Dak.	G	+	+	3	2	215
	4	D7643	1979	S.Dak.	G	+	+	3	2	215
	5	C4943	1973	S.Dak.	G	+	+	3	2	215
	3	E5276	1973	S.Dak.	G	+	+	3	2	218
	5	E5449	1979	S.Dak.	G	+	+	3	2	40
	5	G4218	1978	Colo.	G	+	+	3	2	34
M11b	6	PR110	1996	S.Dak.	M	+	+	1	1	228
	6	PR115	1996	S.Dak.	M	+	+	1	1	228
	6	UT6-96	1996	S.Dak.	M	+	+	1	2	226
M11c	7	C5276	1973	S.Dak.	M	+	+	1	1	217
M11d	8	PR79	1996	S.Dak.	G	+	+	3	2	225
	8	PR109	1996	S.Dak.	G	+	+	3	2	221
M1a	9	PR20	1996	S.Dak.	M	−	+	1	1	222
	9	PR101	1996	S.Dak.	M	−	+	1	1	221
	9	PR130	1996	S.Dak.	M	−	+	1	1	229
	9	E5340	1979	S.Dak.	M	−	+	1	1	219
	9	E7798	1980	S.Dak.	M	−	+	1	1	220
	9	E8392	1980	S.Dak.	M	−	+	NDb	ND	ND
	9	E9026	1980	S.Dak.	M	−	+	ND	ND	ND
	9	F1788	1981	S.Dak.	M	−	+	ND	ND	ND
	9	F1803	1981	S.Dak.	M	−	+	ND	ND	ND
	9	F2726	1982	S.Dak.	M	−	+	ND	ND	ND
	9	F4306	1983	S.Dak.	M	−	+	ND	ND	ND
	10	E9134	1980	S.Dak.	M	−	+	ND	ND	ND
M15	11	D7920	1979	S.Dak.	I	+	+	ND		38
		G4221	1977	N.Mex.	I	+	+	1	2	36
M16	12	G4217	1979	Calif.	M	+	+	3	2	33
G3a	13	PR26	1996	S.Dak.	G	−	−	ND	ND	223
G3b	13	PR120	1996	S.Dak.	G	−	−	ND	ND	230
G5	3	PR75	1996	S.Dak.	G	+	+	3	2	224

^aM, mitis; I, intermedius; G, gravis. 

^bND, not done.