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Amaç: Dünya genelinde hepatit delta virüsünün (HDV) yaygınlığı coğrafi farklılıklar göstermektedir. Her ne kadar Türkiye'de hepatit B yüzey antijeni (HBsAg) pozitif olan hastalarda anti-HDV seroprevalans oranları konusunda birçok çalışma olmasına rağmen, bu hasta popülasyonunda HDV-RNA prevalansı ile ilgili çalışmalar sınırlıdır. Bu çalışmada HBsAg pozitif olan hastalarda anti-HDV antikorları ve HDV-RNA sıklığının saptanması amaçlandı. Gereç ve Yöntemler: Bu retrospektif çalışma, Nisan 2015 ve Mart 2017 tarihleri arasında HBsAg-pozitif hastalarda anti-HDV testi çalışılan 2089 hastayı kapsadı. HBsAg-pozitif hastalardan alınan serum örneklerinde anti-HDV testi, enzim bağlı immünosorbent metod kullanılarak yapıldı. Anti-HDV-pozitif hastalarda, HDV-RNA, gerçek zamanlı polimeraz zincir reaksiyonu ile serum örneklerinde analiz edildi. Bulgular: Anti-HDV seroprevalansı %4,1 (85/2089) iken HDV-RNA oranı %2,4 (51/2089) idi. HDV-RNA, anti-HDV pozitif olan hastaların %60'ında (51/85) tespit edildi. Anti-HDV ve HDV-RNA sıklığı 50-59 yaş grubunda en yüksekti. Sonuç: Bu çalışmada HDV sıklığı bölgesel verilerle tutarlı bulundu. HDV viremisi, anti-HDV pozitif olan hastaların sadece %60'ında (51/85) tespit edildi. Anti-HDV antikorları iyileşmeden sonra da pozitif kalabileceğinden dolayı, HDV'nin gerçek prevalansını belirlemek için HDV-RNA'nın araştırılması önemlidir. Anahtar Kelimeler: Hepatit delta virüs, anti-HDV, HDV-RNA, HBV Objectives: The prevalence of hepatitis delta virus (HDV) worldwide shows geographical differences. Although there are several studies on anti-HDV seroprevalence rates in hepatitis B surface antigen (HBsAg)-positive patients in Turkey, studies on HDV-RNA prevalence in this patient population are limited. It was aimed to detect the frequency of anti-HDV antibodies and HDV-RNA in HBsAg-positive patients in this study. Materials and Methods: This retrospective study included 2089 HBsAg-positive patients in whom anti-HDV was analyzed between April 2015 and March 2017. Anti-HDV test was performed in serum samples obtained from HBsAg-positive patients by enzyme-linked immunosorbent assay. In anti-HDV-positive patients, HDV-RNA was analyzed in serum samples by real-time polymerase chain reaction. Results: The seroprevalence of anti-HDV was 4.1% (85/2089), while the rate of HDV-RNA positivity was 2.4% (51/2089). HDV-RNA was detected in 60% (51/85) of anti-HDV-positive patients. The frequency of anti-HDV and HDV-RNA was highest in the 50-59 age group. Conclusion: The frequency of HDV in this study was found to be consistent with regional data. HDV viremia was detected in only 60% (51/85) of the anti-HDV-positive patients. Since anti-HDV antibodies may remain after recovery, it is important to investigate HDV-RNA to determine the true prevalence of HDV.

Human herpesvirus 8 (HHV-8), classified in Herpesviridae family, is the etiological agent of Kaposi's sarcoma (KS), primary effusion lymphoma and multicentric Castleman's disease. In contrast to the other herpesviruses, HHV-8 seroprevalence is low in general populations; however, the higher prevalence observed in individuals with immunodeficiencies such as AIDS poses an increased risk for KS. The global distribution of HHV-8 shows great variations, with the highest seroprevalence seen in Africa. The number of studies on the seroprevalence of HHV-8 in Turkey are limited. The aim of this study was to determine the HHV-8 seroprevalences in healthy blood donors and HIV-positive patients, that will contribute HHV-8 seroepidemiological data in our country. This study was designed as a cross-sectional study. A total of 551 healthy donors (76 female, 475 male; age range: 18-65 years) admitted to Ege University Medical School Hospital, Blood Center for blood donation between December 2013-January 2014, and 173 HIV-positive patients (30 female, 143 male; age range: 18-65 years) admitted to infectious diseases outpatient clinic between October 2013-January 2014, were included in the study. A commercial ELISA method (KSHV/HHV-8 IgG ELISA Kit, Advanced Biotechnologies Inc, USA) was used for the detection of IgG antibodies that were structured against HHV-8 lytic antigens. In the study, 29 (29/551, 5.3%) of blood donors and 44 (44/173, 25.4%) of HIV-positive patients, with a total of 73 (73/724, 10.1%) cases were found as HHV-8 seropositive. The difference between blood donors and HIV-positive patients in terms of HHV-8 seropositivity rates was statistically significant (5.3% versus 25.4%; p< 0.05). In both of the study groups, no statistically significant difference was detected between HHV-8 seropositivity with gender and age. When considering HIV-positive patients, no statistically significant difference was observed between HHV-8 seropositivity with the duration of anti-HIV positivity, CD4(+) T cell count, HIV-RNA status and history of having sexually transmitted disease. As a result, HHV-8 seroprevalence rate detected in our study is similar to the data of other studies performed in Turkey, as well as the rates reported from other European and Asian countries.

The majority of patients with HCV infection had genotype 1 (82.5%), followed by genotype 3, 2 and 4. Monitoring the change in HCV genotype distribution is critical for the development of effective strategies for HCV elimination.

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