TABLE 1.

Polymerase chain reaction primers used for detecting mutations of H. pylori strains in this study.

Antibiotics	Genes	Primer sequence (5′–3′)
clarithromycin	23S rRNA	F: ACAGCACTTTGCCAACTCGTAA R: GCTTGTGCCATTACACTCAACTTG
amoxicillin	PBP-1A	F: GCCATTCTTATCGCTCAAGTTTGG R: ATCGCTAAAATGTTACGCATGAAATACG
levofloxacin	gyrA	F: TGGGGATTGATTCTTCTATTGAAGA R: TGCACTAAAGCGTCTATGATTTCA
Tetracycline	16S rRNA	F: TCCGTAGAGATCAAGAGGAATACTCATTG R: TCACCGCAACATGGCTGATTTG
furazolidone	oorD	F: GGCTTGCCTGGAAATCCTGTAG R: AACCGATTTGCTCCACTTTCAATGA
	porD	F: GCAAGAAGTCATTGACGC R: GGGGTGATAGGATAGGCT
metronidazole	rdxA	F: GCAGGAGCATCAGATAGT R: GGGTGATTTCTTGGTTGC