TABLE 1.

ESBL-positive clinical samples with and without enrichmenta

Patient with ESBL+ strainNo. of cultured swabs from patientCulture without enrichment in TSBbCulture with enrichment in TSBc
No. of ESBL+ swabs (cultured on BLSE agar)No. of days in ICU until first positive swabIdentified ESBL+ microorganismNo. of ESBL+ swabs (cultured on BLSE agar)No. of days in ICU until first positive swabIdentified ESBL+ microorganism(s)
1410 E. coli 20 E. coli
21458 E. coli 71 E. coli and Raoultella ornithinolytica
31917 E. coli 31 E. coli and Proteus mirabilis
4420 Enterobacter cloacae 10 E. cloacae
5211 Citrobacter freundii 1d1 C. freundii
6230216 E. coli
76020 P. mirabilis
8901d18 Achromobacter xylosoxidans
980114 E. coli
  • a The times to the first positive swab were, on average, 3.2 days for culture without enrichment and 0.6 days for culture with enrichment.

  • b There were, in total, 10 swabs with ESBL+ strains from 5 patients and 490 swabs without ESBL+ strains from 83 patients.

  • c There were, in total, 20 swabs with ESBL+ strains from 9 patients and 480 swabs without ESBL+ strain from 79 patients.

  • d These were the only two swabs with ESBL producers from the throat; all other 18 positive cultures were from fecal swabs.