FIG. 4.

Susceptibility of H. pylori wild-type and mutant strains to UV exposure. H. pylori wild-type strain JP26 and recA, recG, and vacA mutant strains were assayed for survival after exposure to UV (wavelength of 312 nm) for 0 to 60 s. As expected, the recA mutant showed significantly greater susceptibility to UV compared to that of wild-type JP26. The susceptibilities of recG and vacA (control) mutants were not significantly different from that of the wild-type strain. The results from one representative experiment are shown (four trials were performed). 1.E-07, 10⁻⁷.