TABLE 3.

Plasmid content of 64 selected E. aerogenes strains

Enzyme (n)^a	Year(s)	Profile R/E^b	Presence of plasmid and hybridization^c		No. of isolates by year
Enzyme (n)^a	Year(s)	Profile R/E^b	180 kb	85 kb	No. of isolates by year
TEM-24 (24)	88/94	A/1	+	⊕	2/1
	91	A/1	−	⊕	1
	89/90/91	A/1	⊕	+	1/1/1
	89/90/92/94/96/98^e/99	A/1	⊕	−	1/1/1/1/2/10/1
TEM-3 (12)	88/89/96/99	A/1	−	⊕	1/1/1/1
	90/94/98	A/1	+	⊕	1/1/1
	91/98	A/1-E/2	⊕	+	1/2
	92/97	A/1	⊕	−	1/1
TEM-8 (1)	91	A/4	+	⊕	1
SHV-4 (3)	93/94/98	B/1-E/4-F/2	⊕	−	1/1/1
TEM-1/2 (12)	93	B/1	⊕	−	1
	88-92/94-99	A/1	⊕	−	1/1
Non-TEM/SHV (12)	90	A/1	+	−	1
	88/89/91-99	11 different profiles^d	−	−	1/1/1

↵a n, no. of strains.
↵b R/E, Ribotyping/ERIC-PCR.
↵c Plasmid presence (+) and positive hybridization with TEM probe (⊕).
↵d B/8-G/1-H/7-I/5-J/1-K/2-L/9-M/1-N/7-O/3-P/3.
↵e 1998: the year of the multicentric study (strains producing TEM-24 isolated from 10 of 12 different centers).