Table 1

The frequency of promoter regions and insertions and deletions identified in TEM-producing E. coli isolates

TEM type (n)aPromoter class (no. of isolates)No. of isolates with:
P3PaPbP4PdelIS26 insertionbIS911 insertioncC31→T39 deletion
TEM-1 (53)27182411
TEM-40 (15)663
TEM-30 (13)5611
TEM-33 (5)23
TEM-185 (4)31
TEM-32 (2)2
TEM- 34 (2)2
TEM-35 (1)1
TEM-76 (1)1
TEM-79 (1)1
  • a n, number of isolates.

  • b The IS26 element was detected upstream of blaTEM, inserted at promoter position 150 (n = 3) or 46 (n = 2) according to the Sutcliffe numbering system (29).

  • c The IS911 element was detected upstream of blaTEM-1, inserted at promoter position 46.