Table 1.

Selection of an amoxicillin-resistant strain of H. pylori

PassesaNo. of passesMIC (μg/ml)
1–540.03–0.06
6–720.125
8–1030.25
11–1880.5
19–2241–2
23–32102–4
33–3864
39–4464–8
  • a H. pylori ATCC 43579 was passed by dilution into fresh media with increasing concentrations of amoxicillin at 3- to 4-day intervals over a 4-month period (see Materials and Methods for details).