Skin flora ≥20 CFUWaterborne flora ≥20 CFU
No. of duodenoscopesQuantity rangeNo. of duodenoscopesQuantity range
Bacillus spp.540–100 CFU Stenotrophomonas maltophilia 3100 - >100 CFU
Micrococcus luteus 5100 CFU Acinetobacter spp.280 and 100 CFU
Staphylococcus epidermidis 450–100 CFU Agrobacterium radiobacter 220 and 100 CFU
Kocuria spp.225 and 100 CFU Paracoccus yeeii 230 and 100 CFU
Staphylococcus hominis 225 and 100 CFU Achromobacter xylosoxidans 1100 CFU
Staphylococcus warneri 250 and 80 CFU Alternaria spp.1>100 CFU
Kocuria rhizophila 1>100 CFU Pseudomonas monteilii 1100 CFU
Micrococcus spp.130 CFU Pseudomonas putida 1100 CFU
Staphylococcus auricularis 1>100 CFU Sphingomonas paucimobilis 1100 CFU
Staphylococcus spp. (CNS)160 CFU Rhizobium spp. or Sphingobium spp.1>100 CFU
  • CFU, colony  forming units; CNS, coagulase - negative staphylococci .