Table 5.

Overall frequency of antibiotic resistance in E. coli and comparison of frequencies between strains isolated from Australia and México

Antibiotic for which resistance was tested% of strains resistant to indicated antibioticLevel of statistical significancea
All strainsMexican strains ( n = 135)Australian strains ( n = 46)
Ampicillin13.418.55.8
Chloramphenicol0.80.60NS
Streptomycin23.932.65.8 ∗∗
Kanomycin2.13.30NS
Neomycin3.42.60NS
Tetracycline5.97.80
  • a For explanation of significance levels, see footnote c , Table 4.