TABLE 2

Time to detection in four different types of blood culture bottles incubated in two blood culture systems

Species/groupNo. of isolatesTime to positivity (median, h)P valuea
FAFA PlusFNFN Plus
3DVirtuo3DVirtuo3DVirtuo3DVirtuo
Gram-negative species3814.511.414.011.413.210.714.511.7<0.0001
    Escherichia coli1014.711.411.59.213.110.111.48.8<0.0001
    Klebsiella spp.1012.69.814.011.912.19.715.012.1<0.0001
    Serratia marcescens1215.311.915.512.014.511.515.512.5<0.0001
    Acinetobacter spp.616.514.014.012<0.0001
Gram-positive species43–4816.313.313.01116.813.714.011.0<0.0001
    Staphylococcus aureus1016.613.813.111.318.714.31310.9<0.0001
    CoNS2–521.816.019.615.533.530.019.617.7<0.0001
    Enterococcus spp.1016.012.913.010.515.011.813.510.1<0.0001
    Beta-hemolytic streptococci521.014.012.010.017.013.814.012.1<0.0001
    Streptococcus pneumoniae1315.011.013.010.316.013.014.011.0<0.0001
    Alpha-hemolytic streptococci3–521.015.017.914.618.914.119.413.6<0.0001
Yeast2750395648<0.0001
    Candida albicans1223.920.826.524.4<0.05
    Candida glabrata1579.268.065.054.0<0.0001
Total108–11316.613.314.012.015.012.014.011.1<0.0001
  • a Comparison of BacT/Alert 3D and BacT/Alert Virtuo using 2-way matched ANOVA.