Summary of study datasets.

aSTs = sequence types; CCs = clonal complexes.bFour historical isolates from 1976, 1983 (n = 2) and 1986 were also included.cOne historical isolate was from The Gambia and another was from Norway. All other isolates were from the UK.dhttp://pubmlst.org/rmlst/.e39% (n = 210) of the genomes were from the UK; 18% (n = 94) genomes were from unknown locations.fThe year of isolation for nearly all of the genomes was unknown; STs and CCs for H. pylori were not defined (see main text).