TABLE 2

Comparative performances of prospective samples by blood culture bottle type

Assay target (n = 913)Bottle type% agreement, no. of samples/total no. (95% CI [%])aNo. of resultsb
PositiveNegativeFNFP
S. aureusBacT/Alert99.1, 116/117 (95.3–99.9)100, 279/279 (98.6–100)10
Bactec95.7, 88/92 (89.4–98.3)99.4, 155/156 (96.5–99.9)41
VersaTREK94.7, 54/57 (85.6–98.2)99.5, 211/212 (97.4–99.9)31
S. epidermidisBacT/Alert98.8, 83/84 (93.6–99.8)98.1, 306/312 (95.9–99.1)16
Bactec95.5, 63/66 (87.5–98.4)98.9, 180/182 (96.1–99.7)32
VersaTREK100, 85/85 (95.7–100)96.7, 178/184 (93.1–98.5)06
S. pneumoniaeBacT/Alert92.3, 12/13 (66.7–98.6)100, 383/383 (99.0–100)10
Bactec85.7, 6/7 (48.7–97.4)99.6, 240/241 (97.7–99.9)11
VersaTREK71.4, 5/7 (35.9–91.8)100, 262/262 (98.5–100)20
E. faecalisBacT/Alert96.6, 28/29 (82.8–99.4)99.7, 366/367 (98.5–100)11
Bactec83.3, 5/6 (43.7–97.0)100, 242/242 (98.4–100)10
VersaTREK100, 26/26 (87.1–100)100, 243/243 (98.4–100)00
E. faeciumBacT/Alert100, 6/6 (61.0–100)99.7, 389/390 (98.6–100)01
Bactec100, 1/1 (20.7–100)100, 247/247 (98.5–100)00
VersaTREK95.4, 21/22 (78.2–99.2)99.6, 246/247 (97.7–99.9)11
mecABacT/Alert99.1, 112/113 (95.2–99.8)91.4, 85/93 (83.9–95.6)18
Bactec92.6, 75/81 (84.8–96.6)100, 77/77 (95.3–100)60
VersaTREK95.6, 87/91 (89.2–98.3)94.7, 54/57 (85.6–98.2)43
vanABacT/Alert100, 4/4 (51.0–100)87.5, 28/32 (71.9–95.0)04
Bactec100, 1/1 (20.7–100)100, 5/5 (56.6–100)00
VersaTREK93.3, 14/15 (70.2–98.8)97.1, 33/34 (85.1–99.5)11
vanBBacT/Alert100, 1/1 (20.7–100)97.1, 33/34 (85.1–99.5)01
BactecNA, 0/0 (NA)100, 6/6 (60.1–100)00
VersaTREK100, 1/1 (20.7–100)100, 47/47 (92.4–100)00
  • a NA, not applicable.

  • b FN, false negative; FP, false positive.