Table 1. Comparison of stx2 subtyping of 444 strains by sequencing and PCR.

Strains that had discrepant results between sequencing and PCR were subjected to a ‘second pass’ PCR.

Subtype	Sequencing results	Subtyping PCR results—1st pass	Subtyping PCR results—2nd pass
2a	82	89	82
2c	194	196	196
2a/2c	167	155	166
No result	1	4	0
Total	444	444	444