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Aspect of the bacterial cultures, after placing the samples on the surface of the culture medium (A) and after removing the samples (B): (a) Gram-positive E. faecalis VRE, (b) Gram-positive S. epidermidis 2018, (c) Gram-negative E. coli ATCC 25922, and (d) Gram-negative K. pneumoniae ATCC 10031.
