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Background: Chronic hepatitis C virus (HCV) infection affects 58 million people globally. The frequency of HCV infection in the general Iranian population is less than 0.5%; however, a concentrated epidemic was reported among people who use drugs, particularly those with a history of drug injection. Objectives: This cross-sectional study was performed to assess the prevalence of HCV infection among high-risk groups outside of prison in northeastern Iran. Methods: A total of 962 participants in Razavi Khorasan province were enrolled from 2018 to 2022. They included drug users referred to drug treatment and harm reduction centers and individuals with a history of crimes such as drug use or imprisonment who worked in a private industrial unit. Serum anti-HCV antibodies were assessed using a rapid or ELISA kit, and seroreactive samples were confirmed by single-step reverse transcriptase or qualitative real-time polymerase chain reactions. A P-value < 0.05 was considered statistically significant. Results: The mean age of 707 males and 255 females was 39.8 ± 10.2 years. Anti-HCV antibodies were detected from 129 samples (13.41%), of which 107 were available for polymerase chain reaction testing. HCV RNA was detected in 88 cases (75.2%); the total viremia rate was calculated as 9.26% (88/950). Logistic regression analysis revealed that HCV infection among drug users was significantly associated with older age (P = 0.002), being single (P = 0.009), and history of drug injection (P < 0.001) or incarceration (P = 0.04). Conclusions: The findings showed a considerably high prevalence of HCV infection among people who use drugs in northeastern Iran. To achieve the global goal of viral hepatitis elimination by 2030, we strongly recommend stricter screening and treatment of this infection among such hard-to-access populations in Iran. [ABSTRACT FROM AUTHOR]

Context: Various frequency rates of occult hepatitis B virus infection (OBI) are reported from different parts of Iran. This systematic review and meta-analysis aimed to characterize the OBI epidemiology in Iran and estimate the pooled prevalence among different populations. Evidence Acquisition: Nine internationalandPersian electronic databases, as well assomeconference proceedings, were searched. Original cross-sectional studies up to December 2018 were included if they investigated the prevalence of OBI by the detection of serum hepatitis B virus surface antigen and hepatitis B virus nucleic acid in at least 30 samples selected with any sampling methods. Comprehensive meta-analysis software was used to analyze the data, and Cochran's Q-test and I-square statistics were applied to assess the heterogeneity. Meta-regression analysis was performed to assess the impact of the year of study on the OBI frequency. A P value < 0.05 was considered as the level of significance. Results: Of 412 citations found in electronic sources and 35 relevant citations added by searching the gray literature, 83 nonduplicated non-overlapping studies were evaluated. A total of 55 documents comprising 14,485 individuals from 16 provinces met the inclusion criteria and were used in the analysis. The prevalence of OBI considerably varied in different parts of the country with the highest prevalence (63.1%) reportedamongthe HIV-positive population in Fars province. The rates of the OBI prevalencewereestimatedat 0.06% (95% CI: 0.02 - 0.16%)amongblood donors (BDs) regardless of their anti-HBc status, 7.90% (95% CI: 4.33 - 13.99%)among anti-HBc positive BDs, 2.49% (95% CI: 1.2 - 4.81%) among hemodialysis (HD) patients, 4.44% (95% CI: 1.56 - 12.02%) among HIV-positive patients, and 7.76% (95% CI: 4.57 - 12.86%) among HCV-positive patients. No significant trends were observed in OBI prevalence rates among different groups over time (P > 0.05). Conclusions: This review revealed high rates of OBI prevalence among high-risk populations in Iran. It is strongly suggested that occult hepatitis B be investigated among populations with a high chance of its occurrence in our country. [ABSTRACT FROM AUTHOR]

Background: Hepatitis B virus (HBV) infection is a significant health problem throughout the world. Objectives: We aimed to evaluate the prevalence of hepatitis B antigen (HBsAg) seropositivity in the general population of Mashhad, northeast of Iran. Patients and Methods: One thousand six hundred fifty-two healthy individuals aged 1 to 90 (Mean; 29.1 ± 18.5) from all 12 municipalities of Mashad were selected randomly by multistage cluster sampling. Informed consent was obtained, and demographics and medical histories were collected. Twice-reactive samples were considered HBsAgpositive by ELISA. Chi-square test and logistic regression were applied to analyze the factors related to HBsAg positivity using SPSS 16.0. Results: The overall prevalence of HBsAg positivity was 1.39% (95% CI, 0.91% to 2.12%); 2.0% and 0.89% among men and women, respectively (p = 0.054). Infection was more prevalent in older (p = 0.019) and married persons (p = 0.001), Afghanis (p = 0.046), and those with a history of traditional cupping (p = 0.005). There was no association between HBV infection and gender; literacy; income; employment; family size; or history of blood transfusion, dental procedure, surgery, hospitalization, or tattooing. By logistic regression analysis, age was the only variable that had a significant association with infection (p = 0.026). Conclusion: It seems that the prevalence of HBV infection in Mashhad is slightly lower than that of the nation. [ABSTRACT FROM AUTHOR]