TABLE 1.

Characteristics of multiple-drug-resistant Salmonella enteritidis^a

No.	Yr	Resistance patternb	Resistance plasmid			Other plasmids (kb)	pI of βls
			TF at 28°C	TF at 37°C	kb
1	1990	A (>512), CTH (32), RIF (8)	0	2.6 × 10−5c	5.2	60	5.2
2	1991	I (128), SXT (>128), RIF (8)	1.3 × 10−6	2.5 × 10−6	105	60	NA
3	1991	SXT (64), RIF (8)	0	0	ND	98, 60	NA
4	1991	CXM (16), RIF (4)	0	0	ND	78	ND
5	1992	CXM (16), S (16), RIF (8)	0	0	ND	78	ND
6	1992	S (16), RIF (4)	0	0	ND	78, 3.6, 3.1	NA

^aAbbreviations: Yr, year isolated; TF, transfer frequency; βls, β-lactamase; NA, not applicable; ND, not detected; A, ampicillin; CTH, cephalothin; CXM, cefuroxime; RIF, rifampicin; SXT, trimethoprim-sulfamethoxazole. 

^bDrugs resistance to which was transferred or mobilized are underlined; MICs are shown in parentheses. 

^cFrequency of mobilization.