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. 2019 Feb 16;178:8–21. doi: 10.1016/j.colsurfb.2019.02.009

Table 2.

Limit values suggested for aerobic colony count of microorganisms in different types of surfaces.

Local Aerobic colony count (limit value) Indicator microorganisms Entity/Researcher
Food-contact surfaces 10 CFU/cm2 1 CFU/cm2 for Enterobacteriaceae [12]
Public spaces’ surfaces – – –
Hospital surfaces 5 CFU/cm2 1 CFU/cm2 for S. aureus (including methicillin resistant), C. difficile, multiply resistant Gram-negative bacilli, vancomycin-resistant Enterococci, Salmonella spp, Acinetobacter spp [20]
2.5 CFU/cm2 – [50]
2.5 CFU/cm2 1 CFU/cm2 for Enterobacteriaceae and S. aureus [21]