Table 4. Shifts in allele frequency in contingency gene Cj0045 in single-colony isolates of 33292 during mouse passage.

Experiment	Single-colony isolates	Non-passaged or mouse passaged	Number of mice	Allele frequency (%) in Cj0045 HT*
				<8G	9G	10G	11G	12G	>13G
G1	33292-SC5	Non-passaged	na†		3	28	66‡	3
		Mouse passaged	2		10	4	24	61	2
		Mouse passaged	1	7	6	85	2
	33292-SC13	Non-passaged	na	15	85
		Mouse passaged	3	12	88
G2	33292-SC5	Non-passaged	na	2	3	34	58	3
		Mouse passaged	5	7	83	8	1	1
		Mouse passaged	1	9	41	49	1
		Mouse passaged	1			4	30	63	3
	33292-SC9	Non-passaged	na	2	5	37	53	3
		Mouse passaged	4	10	79	9	1	2
		Mouse passaged	1		1	5	26	65	3
	33292-SC4	Non-passaged	na	8	85	7
		Mouse passaged	5	9	87	4
		Mouse passaged	1	5	15	77	3
	33292-SC13	Non-passaged	na	13	84	3
		Mouse passaged	7	9	88	2

^*Fragment analysis was performed on C. jejuni in the mouse inoculum (non-passaged) or recovered from individual mice (mouse-passaged). Numbers represent the mean allele frequencies.

^†na, Not applicable.

^‡Predominant alleles in a population are in bold type. SC5 and SC9 mouse inocula carry the 11G unsuccessful allele as the predominant allele. SC4 and SC13 mouse inocula carry the 9G successful allele as the predominant allele.