Research Article

Occult Hepatitis B Infection among Hemodialysis Patients in Tabriz, Northwest of Iran: Prevalence and Mutations within the S Region

Figure 1

(a) Agarose gel electrophoresis of the nested PCR for OBI. C+: positive control; L: 100 bp DNA ladder; C−: negative control; S: OBI-positive samples (227 bp). (b) Agarose gel electrophoresis of the second round of nested PCR for HBsAg amplicon with a length of 700 bp. C+: positive control; L: 100 bp DNA ladder; C−: negative control; S: amplified fragment for sequencing (700 bp).
(a)
(b)