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Background: Occult hepatitis B infection (OBI) refers to the presence of hepatitis B virus (HBV) DNA in the serum or liver of individuals who tested negative for HBV surface antigen (HBsAg). This study aimed to determine seropositivity for antibodies against HBV core antigen (anti-HBc) and the frequency of OBI among the HBsAg non-reactive blood donors in Mashhad, northeastern Iran. Methods: In this cross-sectional study, serum samples of HBsAg-negative blood donors were examined for anti-HBc during June and August 2018. Anti-HBc-positive samples were tested for antibodies against HBsAg (anti-HBs), and those with negative results were classified as isolated anti-HBc cases. The presence of HBV DNA in the C, S, and X gene regions was assessed by a qualitative real-time polymerase chain reaction method in all HBsAg-negative samples. OBI subjects were detected by the presence of at least one HBV genomic region. Results: Of 540 HBsAg-negative donors, 29 (5.4%; 95% confidence interval: 3.6--7.6%) showed seroreactivity for anti-HBc, of whom 18 individuals were also seropositive for anti-HBs. All donors showed negative results for all three HBV genes regardless of their serum anti-HBc status. Conclusion: Based on our findings, we suggest routine screening of Iranian blood donation volunteers for serum anti-HBc and anti-HBs but not HBV DNA. [ABSTRACT FROM AUTHOR]

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]

Background: The incidence of sexual transmitted infections (STIs) and HIV/AIDS is globally higher in young people. This study evaluated the prevalence of sexual reproductive behaviors among undergraduate students of Mashhad, Iran. Methods: The study was conducted on 605 students in twelve non-medical faculties of a great university of Mashhad. A self-administered questionnaire was completed on demographic information, sexual contact in the lifetime and during the last three months, and age of first sex. Kaplan-Meier statistic was used to calculate the mean age of initiation of sex. A p<0.05 was considered statistically significant. Results: After exclusion of individuals over 25 years of age, among 590 students with a mean age of 20.8±1.5 years included in the analysis, 71.4% were female and 85.3% were single. Prevalence of at least one sexual contact in life was 15.1% and 35.3% of single sexually experienced students reported to have sex in the last three months. The lifetime prevalence of sexual relationship in males was significantly higher than females (32.9% vs. 7.6%, p<0.001). The mean age of first sexual experience was 23.7 years with a significant difference between both sexes (p<0.001). In single sexually experienced students, the mean age at first sex was 17.6±3.3 years, 24% started sexual activity at <15 years, 34.3% had at least 3 partners and only 40.6% stated using condom in their last sex. Conclusion: Although very small proportion of females reported premarital sex, a significant minority of male students experienced sexual and risky behaviors. Therefore, the use of educational programs on related issues to reduce the risk of STIs/ HIV among youth including university students seems to be a necessity. [ABSTRACT FROM AUTHOR]