TABLE 6.

Mutations leading to truncated forms of InlA among 125 sequenced isolates from L. monocytogenes lineage II

Mutationa	Equivalentb	MLGT probe(s)c	MLGT haplotype(s)	RTE (%)d
T189		Lm2.INLa8, Lm2.INLa13	Lm2.8, Lm2.30	3.9
T492	H1	Lm2.INLa9, Lm2.INLa14	Lm2.20, Lm2.34, Lm2.38	3.9
T577	LO28	Lm2.INLa11, Lm2.INLa15	Lm2.24	2.6
T685	NV5	Lm2.INLa10	Lm2.21	0.0
T700	PMSC3	Lm2.INLa7, Lm2.INLa12	Lm2.5, Lm2.19, Lm2.33	20.8

^aMutation nomenclature reflects the amino acid position of premature stop codons relative to the 800-amino-acid protein predicted for strain EGD-e (NC_003210).

^bStrain names or previous designations for equivalent mutations described by Jonquieres et al. (19), Olier et al. (29), Rousseaux et al. (39), and Nightingale et al. (26).

^cFour of the five truncation mutations were targeted by pairs of reciprocal probes, one of which was specific to the nucleotide character state responsible for the truncation, while the other probe was specific to the alternate form of the inlA allele. After multiple attempts, only a single acceptable probe was identified for the T685 mutation.

^dFrequency of InlA truncation mutations among 77 lineage II isolates collected by USDA-FSIS from RTE products and processing facilities.