Figure 1 .

Hybridisation with cagA probe of subcultures of different H pylori colonies from primary plates streaked with biopsy samples taken from two gastric areas from the same patient. All 16 colonies from the antrum and 18 of 21 from the corpus are cagA+ (six of 13 colonies from the fundus were cagA+; data not shown). The arrows indicate the cagA− colonies.