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Freeman method—qualitative evaluation of the biofilm-forming capacity of the bacteria cultured on a Congo Red-containing medium. A—non-biofilm producer Staphylococcus epidermidis ATCC 12228 (the negative control), B—non-biofilm producer K/18/313 (clinical strain), C—biofilm producer S. epidermidis ATCC 35984 (the positive control), D—biofilm producer K/12/8915 (clinical strain).
