TABLE 1.

Composition of bias/precision bacterial test groups for Etest validation

Test groupOrganismNo. of strains tested
AerobesAcinetobacter baumannii1
Enterobacter agglomerans1
Enterobacter cloacae2
Escherichia coli2
Citrobacter spp.1
Klebsiella pneumoniae2
Klebsiella oxytoca1
Morganella morganii1
Pseudomonas aeruginosa1
Serratia spp.1
Stenotrophomonas maltophilia1
Enterococcus faecalis2
Enterococcus faecium2
Enterococcus gallinarum1
Staphylococcus aureus4a
Staphylococcus epidermidis1
CNSb2c
Total26
NonpneumococcalStreptococcus pyogenes9
    streptococciStreptococcus agalactiae9
Viridans group streptococci8
Total26
AnaerobesBacteroides fragilis9
Bacteroides ovatus4
Bacteroides thetaiotaomicron7
Bacteroides vulgatus6
Total26
S. pneumoniae28
H. influenzae25
Bias/precision collection total131
  • a Two methicillin-susceptible S. aureus and two methicillin-resistant S. aureus strains.

  • b CNS, coagulase-negative Staphylococcus spp.

  • c Both isolates were methicillin resistant.