Nature 397, 176–180 (1999)

Typographical errors in Table 1 caused the transposition of some numbers between the H. pylori 26695 and J99 columns. The affected rows should read as follows.

vacA genotype: 26695, sla/ml; J99, slb/ml

Functionally classified ORFs: 26695, 895; J99, 874

Conserved with no function ORFs: 26695, 290; J99, 275

H. pylori -specific ORFs: 26695, 367; J99, 346

In the table footnote, the coordinates of the second 26695 23S rRNA sequence should read 1,473,499–1,476,836.