TABLE 1.

Characterization of S. enterica serotype Typhi strains from Vietnam

Resistance pattern	Plasmid size (kb)	Plasmid fingerprint		Molecular type		Total
		EcoRI	HindIII	Group	Ribotype and DNA type	No. of isolates	% of isolates
Chloramphenicol	98	E1	H1	27	P58N9022	11	15
		E1	H1	1	P904N9022	5	7
		E1	H1	4, 37, 39, 176	P904N9025, P58N9023, P58N9025, P85N9023	5	7
		E3	H3	48	P58N115	2	3
Subtotal						23	32
Tetracycline and chloramphenicol	221	E2	H2	29	P58N9026	2	7
		E2	H2	66	P33N108	3	4
	221, 5	E2	H2	25, 46	P904N101, P58N101	2	3
	221, 98	E2, E1	H2, H1	29	P58N9026	1	1
		E2a, E1	H2a, H1	29	P58N9026	1	1
	221	E5	H5	68	P33N114	1	1
Subtotal						10	14
Sensitive	5			6 groups		6	8
	98	E1	H1	27	P58N9022	5	7
		E1	H1	1	P904N9022	4	5
		E1	H1	32, 77	P58N907, P903N9022	2	3
		E4	H4	4	P904N9025	1	1
	151	—a	—	67	P33N110	1	1
	Nil			18 groups		21	29
Subtotal						40	55
Total (35 groups)						73	100

^a—, not done.