Combined antibacterial effect of essential oils from three most commonly used Ethiopian traditional medicinal plants on multidrug resistant bacteria

Table 5 The mean fractional inhibitory concentration index for MDR bacteria at AAU, 2018

Combined	Gram positive MRSA	multidrug resistant gram negative bacteria
Combined	Gram positive MRSA	E.coli (R)	K. pneumoniae (R)
B. cuspidata + B.ogadensis	0.38^b	0.75^a	0.25b
B. cuspidata + B.ogadensis	1.50^c	3.00^d	0.50^b
B. ogadensis + T.schimper	3.00^d	3.00^d	1.00^a

The values represent mean fractional inhibitory concentration index (n = 6), where, ^aX represents partial synergy while ^bX synergy interaction. ^cX represents indifference interaction while ^dX represents antagonistic interaction of essential oil