TABLE 3.

Occurrence of premature inlA stop codons among six EcoRI ribotypes found to contain these mutations

Ribotype	Mutation type	Incidence of premature inlA stop codon (no. of isolates with mutation [no. of isolates screened]) among isolates obtained from:			Prevalence (%) of premature inlA stop codon among all isolates
		Humans	Food	Total
DUP-1052Aa	1	7 (35)	13 (27)	20 (62)	32.3
DUP-16635Ab	1	0 (0)	5 (5)	5 (5)	100.0
DUP-1025Ac	2	0 (5)	2 (6)	2 (11)	18.2
DUP-1031Ad	2	0 (0)	1 (1)	1 (1)	100.0
DUP-1062Ae	3	12 (12)	55 (55)	67 (67)	100.0
DUP-1046Bf	3	0 (0)	3 (3)	3 (3)	100.0

^aData represent 54 isolates from isolate set 4 (Table 1), one food isolate with ribotype DUP-1052A from isolate set 1, and five human and two food isolates from the work of Nightingale et al. (24).

^bData represent four isolates from isolate set 6 (Table 1) and one food isolate with ribotype DUP-16635A from isolate set 1.

^cData represent eight isolates from isolate set 5 (Table 1), one food isolate with ribotype DUP-1025A from isolate set 1, and one human and one food isolate from the work of Nightingale et al. (24).

^dData represent one food isolate with ribotype DUP-1031A from isolate set 1 (Table 1).

^eData represent 62 isolates from isolate set 3 (Table 1), one food isolate with ribotype DUP-1062A from isolate set 1, and four food isolates from the work of Nightingale et al. (24).

^fData represent one food isolate with ribotype DUP-1046B from isolate set 1 and two food isolates from the work of Nightingale et al. (24).