Effect of the presence of H. pylori CFU on LAMP sensitivity. Various numbers of CFU of H. pylori were amplified, and the products were separated by gel electrophoresis and subjected to turbidity assay. The numbers above each lane represent 106 (lane 1), 105 (lane 2), 104 (lane 3), 103 (lane 4), 102 (lane 5), 101 (lane 6), 0 (lane 7), and negative (N; lane 8) CFU per reaction tube of template DNA of H. pylori. PCR conditions are described in the text. Lanes M, DNA size markers. k, kilobase pairs.