Table 2.

Mean of minimal inhibitory and bactericidal concentrations of oregano essential oil and biological silver nanoparticles.

Bacteria	OEO (mg/mL)		bio-AgNP (μM)
	MIC	MBC	MIC	MBC
S. aureus (ATCC 25923)	0.596	0.596	250.0	250.0
S. mutans (ATCC 25175)	0.596	0.596	125.0	250.0
E. coli (ATCC 25922)	0.596	0.596	62.50	62.50
S. enterica Enteritidis (ATCC 13076)	0.298	0.298	62.50	62.50
K. pneumoniae (ATCC 10031)	0.596	0.596	62.50	62.50
K. pneumoniae (ATCC 700603)	0.596	0.596	125.0	125.0
S. enterica Typhimurium UK-1*	0.298	0.298	125.0	125.0
MRSA N315	0.596	0.596	250.0	250.0
MRSA 101	1.193	1.193	250.0	500.0
MRSA 107	1.193	1.193	250.0	500.0
E. coli ESBL 167	0.596	0.596	125.0	125.0
E. coli ESBL 169	0.596	0.596	125.0	125.0
E. coli ESBL 176	0.596	0.596	125.0	125.0
E. coli ESBL 192	0.596	0.596	125.0	125.0
E. coli KPC 131	0.596	0.596	125.0	125.0
E. coli KPC 133	0.596	0.596	125.0	125.0
A. baumannii CR 01	0.298	0.298	125.0	125.0

OEO, oregano essential oil; bio-AgNP, biological silver nanoparticles.

MIC, minimal inhibitory concentration; MBC, minimal bactericidal concentration.

ATCC, American Type Culture Collection.

^*, ATCC 68169.

MRSA, methicillin resistant S. aureus.

ESBL, extended spectrum beta-lactamase; KPC, K. pneumoniae carbapenemase.

CR, Carbapenem-resistant;

101, 107, 167, 169, 176,192, 131, 133, and 01 are strain numbers at Laboratory of Basic and Applied Bacteriology-Universidade Estadual de Londrina.