Antibacterial activity of Centaurea pumilio L. root and aerial part extracts against some multidrug resistant bacteria

Table 4 Inhibition zone diameters of chloroform aerial part C. pumilio extract and EO against MDR strains

Inhibition zone diameter (mm)
MDR Strain	Chloroform aerial part extract	EO
A. baumannii strain1	11.67 ± 0.33^abc	–
A. baumannii strain2	22.00 ± 0.00^abc	–
A. baumannii strain3	20.00 ± 0.00^abc	–
A. baumannii strain4	16.00 ± 0.00^abc	–
A. baumannii strain5	11.33 ± 0.33^abc	–
A. baumannii strain6	21.67 ± 0.33^abc	–
A. baumannii strain7	14.67 ± 0.33^abc	–
A. baumannii strain8	20.00 ± 0.00^abc	–
A. baumannii strain9	23.33 ± 0.33^abc	–
E. coil strain1	14.67 ± 0.33^ab	–
E. coli strain2	17.67 ± 0.33^ab	9.00 ± 0.58
E. coli strain3	14.33 ± 0.33^ab	–
K. pneumonia strain1	16.00 ± 0.00^abc	–
K. pneumonia strain2	12.00 ± 0.00^abc	–
K. pneumonia strain3	12.67 ± 0.33^abc	–
K. pneumonia strain4	25.00 ± 0.00^abc	–
K. pneumonia strain5	24.00 ± 0.00^abc	12.67 ± 0.33
K. variicola	12.00 ± 0.00^a	10.33 ± 0.33
P. aeruginosa strain1	20.00 ± 0.00^c	–
P. aeruginosa strain2	25.00 ± 0.00^c	7.33 ± 0.33
P. aeruginosa strain3	27.00 ± 0.00^c	7.33 ± 0.33
P. aeruginosa strain4	17.33 ± 0.33^c	9.33 ± 0.33
P. aeruginosa strain5	25.00 ± 0.00^c	11.33 ± 0.33
S. aureus MRSA strain1	21.00 ± 0.00^bc	4.00 ± 0.00
S. aureus MRSA strain2	20.00 ± 0.00^bc	–
S. aureus MRSA strain3	28.00 ± 0.00^bc	10.00 ± 0.58

Different small letters (a-c) indicate significant data variability at P < 0.05 checked by one-way ANOVA. No letters indicate no significant variability
MDR multidrug resistant, EO essential oil