Table 1.

Origins of the strains

PatientWardDate of isolationSource of isolateOrganismapI(s) of β-lactamase
1Intensive care unit20 April 1998SputumEA (+)6.5, 8.3
22 May 1998StoolEA (+)6.5, 8.3
EC (+)6.5
17 June 1998SputumEA (+)6.5, 8.3
KP (+)6.5, 7.7
PV (+)6.5, >8.3
17 June 1998StoolEA (+)6.5, 8.3
2Urology surgery unit24 October 1998StoolEA (+)6.5, 8.3
31 October 1998Surgical woundEA (+)6.5, 8.3
KP (+)6.5, 7.7
PV (+)6.5, >8.3
3Dermatology unit24 August 1998UrineEA (+)6.5, 8.3
18 November 1998StoolEA (+)6.5, 8.3
EC (+)6.5
KP (+)6.5, 7.7
4Neurosurgery unit29 September 1999SputumEC (−)
3 October 1999StoolEA (+)6.5, 8.3
20 November 1999SputumEA (+)6.5, 8.3
EC (+)6.5
EC (−)
3 December 1999SputumEA (+)6.5, 8.3
28 February 2000SputumPM* (−)5.4
29 March 2000Surgical woundPM* (+)5.4, 6.5
EA* (+)6.5, 8.3
5Rehabilitation unit24 February 2000SputumEA (+)6.5, 8.3
6 March 2000SputumEA (+)6.5, 8.3
SM (+)6.5, >8.3
SM (−)>8.3
  • a EA, E. aerogenes; EC,E. coli; KP, K. pneumoniae; PV, P. vulgaris; PM, P. mirabilis; SM, S. marcescens; (+), ESBL-producing strain; (−), non-ESBL-producing strain; *, strain resistant to imipenem.