TABLE 2.

Composition of clinical and challenge bacterial test collections for Etest validation

Test GroupOrganismSite (no. of organisms tested)No. of TGC nonsusceptible organisms testeda
123
AerobesAcinetobacter spp.777NAb
Citrobacter spp.10108
E. agglomerans5531
E. cloacae1010102
E. coli181818
K. pneumoniae2020203
Serratia spp.7777
E. faecalis7713
E. faecium101010
S. aureus1717170
CNSc7771
Total11811812014
NonpneumococcalS. pyogenes484039
    streptococciS. agalactiae141515
Viridans group streptococci3730302
S. dysgalactiae01515
Total99100992
AnaerobesB. fragilis46426013
B. ovatus171304
B. thetaiotaomicron2320286
B. vulgatus141061
Bacteroides spp.01516
Total10010011024
S. pneumoniae97100100NA
H. influenzae97100100NA
Total clinical collections51151852940
Challenge groups
AerobesAcinetobacter spp.4NA
Citrobacter spp.4
E. agglomerans2
E. cloacae5
E. coli5
Klebsiella spp.10
M. morganii1
P. stuartii11
P. aeruginosa2NA
S. maltophilia3NA
Serratia spp.2
E. faecalis4
E. faecium3
E. gallinarum1
S. aureus141
S. epidermidis1
CNS101
Total723
NonpneumococcalS. pyogenes25
    streptococciS. agalactiae25
Viridans group streptococci211
Total711
AnaerobesB. fragilis362
B. ovatus122
B. thetaiotaomicron172
B. vulgatus101
Total757
S. pneumoniae75NA
H. influenzae75NA
Total-challenge strains36811
Total-all strains tested1,92651
  • a Includes tigecycline-intermediate and -resistant organisms.

  • b NA, not applicable since breakpoints have not been defined for this organism.

  • c CNS, coagulase-negative Staphylococcus spp.