Results of PCR with urease gene primers specific for H. hepaticus. (A) Lanes 1 to 11, 11 strains of H. hepaticus from 11 sources; lane 12, 1-kb DNA ladder. (B) Lane 1, H. pylori; lane 2, H. bilis; lane 3, H. felis; lane 4, H. muridarum; lane 5, Flexispira rappini; lane 6, H. trogontum; lane 7, H. rodentium; lane 8, H. mustelae; lane 9, H. hepaticus; lane 10, reagent control; lane 11, 1-kb DNA ladder.