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. 2006 Feb;50(2):785–787. doi: 10.1128/AAC.50.2.785-787.2006

TABLE 1.

Numbers of ESBL-producing E. coli and Klebsiella sp. isolates

Yr of isolation E. coli
Klebsiella spp.
No. of clinical isolates No. (%) of ESBL producers CTX-M group 1/ group 9 % of CTX-M enzymes among ESBLs % of non-CTX-M enzymes among ESBLs No. of clinical isolates No. (%) of ESBL producers CTX-M group 1/ group 9 % of CTX-M enzymes among ESBLs % of non-CTX-M enzymes among ESBLs
1998 5,004 3 (0.06) 0/0 0 100 1,059 16 (1.5) 0/0 0 100
1999 5,300 2 (0.04) 0/1 50 50 1,140 12 (1) 1/0 8 92
2000 4,636 6 (0.13) 2/0 33.3 66.6 938 11 (1.2) 0/0 0 100
2001 6,382 3 (0.05) 1/0 33.3 66.6 1,114 15 (1.3) 0/0 0 100
2002 6,685 7 (0.1) 4/0 57.1 42.9 1,129 7 (0.6) 2/0 28.6 70.4
2003 7,004 19 (0.3) 11/2 68.4 31.6 1,163 8 (0.7) 0/1 12.5 87.5
2004 7,259 20 (0.3) 12/5 85 15 1,209 20 (1.6) 5/1 30 70
    Total 42,270 60 30/8 36.6 63.3 7,752 89 8/3 12.4 87.6