Kotsanas and Gillespie (2016) tested the zone of inhibition and
contact inhibition against a range of microorganisms including gram negative: extended-spectrum[beta]-lactamase Escherichia coli, Stenotrophomonas maltophilia, carbapenemase-producing Klebsiella pneumoniae, and Pseudomonas aeruginosa; and gram positive: methicillin-resistant Staphylococcus aureus, vancomycin-resistant Enterococcus faecium, and coagulase-negative staphylococci), Candida albicans, and spores of Clostridium difficile.