Table 3.

Effect on twitching motility

Drug	Zone diameters(cm)
control	1.16 ± 0.050
CAZ	1.15 ± 0.047
AZM	0.62 ± 0.036a
CAZ + AZM	0.34 ± 0.021a,b,c

^aStatistically significant when compared with no antibiotic treated medium(control), P < 0.01

^bStatistically significant when compared with singly CAZ-treated medium, P < 0.01

^cStatistically significant when compared with singly AZM-treated medium, P < 0.01