Table 4.

Spontaneous FQ^R mutation frequencies of different C. jejuni strains.

	Spontaneous FQR frequencies
C. jejuni Strains	NCTC 11168	IA3902	81–176
Wild type	1.6 × 10−9	0.65 × 10−9	2.3 × 10−9
Δcj1083c	1.1 × 10−9	aNT	NT
Δnth	b1.4 × 10−8	b5.1 × 10−9	b6.8 × 10−9
ΔnthCom	c1.2 × 10−9	NT	NT
ΔmutY	0.61 × 10−7	0.72 × 10−8	1.8 × 10−7
ΔmutYΔnth	d1.2 × 10−7	d1.4 × 10−8	d2.4 × 10−7

^aNT, not tested. ^bStatistically significant difference (p < 0.05) by t-test between Δnth and its respective wild type strains. ^cStatistically significant difference (p < 0.05) by t-test between ΔnthCom and Δnth. ^dStatistically significant difference (p < 0.05) by t-test between ΔmutYΔnth and Δnth strains.