Dear Dr. Nadir Alloui,
Quick & reliable methods of enumerating bacteria on surfaces are well come in the meat processing industry and it is good that the experiment done to show both methods are comparable as one can choose which method to use. Though Pro3S method is faster, there can be instances that the results can deviate far from the actual. For example, if a surface is contaminated with left overs of microscopic fibers of meat together with few bacterial cells after the disinfection, the results can be with errors as the method relies on the amount of proteins present on the surface. Yet one can argue that there can not be left overs of meat fibers after cleaning & disinfection, this is a possibility in real industrial situations.
D.C.Hettiarachchi - Sri Lanka