Table 3.

Frequencies of amoxicillin-clavulanate (AMC)-resistantE. coli isolates by sample

SampleNo. (%) of AMC-resistant E. coli isolates
199619971998
Lower respiratory tract5 (9.4)6 (14.6)b 7 (15.2)b
Urine67 (5.2)67 (5.6)b 52 (4.3)b
Blood8 (6.0)a 4 (3.1)b 2 (1.4)a,b
Deep pus8 (7.3)3 (2.9)b 8 (4.8)b
  • a Significantly lower frequencies of AMC-resistant E. coli isolates in blood in 1998 than in 1996 (P = 0.04).

  • b Significantly higher frequencies of AMC-resistant E. coli isolates in lower respiratory tract samples than in each other type of sample in 1997 and 1998; urine (1997, P = 0.03; 1998, P = 0.04), blood (1997, P = 0.01; 1998, P = 0.0007), and deep pus (1997, P = 0.02; 1998, P = 0.02).