The studied microorganisms included reference strains of Providencia smartii (ATCC29916), Pseudomonas aeruginosa (PA01), Klebsiella pneumoniae (ATCC11296), Staphylococcus aureus (ATCC25922), Salmonella typhi (ATCC6539), Escherichia coli (ATCC8739 and AG100), Candida albicans (ATCC 9002) obtained from the American Type Culture Collection. They were maintained on agar slant at 4˚C and sub-cultured on a fresh appropriate agar plates 24 h prior to any antimicrobial test. Nutrient Agar and Sabouraud Glucose Agar were used for the activation of bacteria and fungi respectively. The Mueller Hinton Broth (MHB) was used for the MIC and MMC determinations. The Mueller Hinton Agar (MHA) was also used for the determination of the MMC on these species.
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