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The aim of our work was to assess the occurrence of serological and molecular-biological markers of HIV, HBV and HCV among medical workers from St. Petersburg. Materials and methods. The study material included 171 blood plasma samples from medical workers from St. Petersburg. The ELISA method was used to qualitatively determine HIV antigen/antibodies (Ag/Ab), HBsAg, antibodies to HBs and HBcore proteins (anti-HBs IgG, anti-HBcore total), and anti-HCV IgG. HIV RNA, HCV RNA and HBV DNA were detected by PCR. For all identified HBV samples, sequencing and subsequent analysis of the nucleotide sequences of the Pre-S1/Pre-S2/S region were performed. Results and discussion. The surveyed group was ranked by age into the following subgroups: 21–35 years (28.07 %), 36–50 years (26.90 %), 51–65 years (31 %) and over 66 years (13.45 %). Serological markers of HBV were detected in 91 (53.22 %) subjects, HCV – in 2 (1.17 %). No markers of HIV were detected. At the same time, markers for HBV and HCV were found in 1 (0.58 %) person. HBV DNA was detected in 4 (2.34 %) medical workers; HCV RNA and HIV were not detected. Significant differences in the prevalence and distribution of the analyzed serological markers between age groups were determined. All HBV isolates belong to genotype D, subgenotypes D1 (50 %) and D2 (50 %). High variability of the Pre-S1/Pre-S2/S region of HBV in the examined group has been shown. The results obtained indicate a relatively low prevalence of HBV and HCV in the examined group. Monitoring of the prevalence of blood-borne infections among medical workers remains an urgent task, primarily in relation to HBV.

The aim of the work was to estimate the prevalence of HIV, HBV and HCV markers among pregnant women and their male partners in the Republic of Guinea.Materials and methods. The material of the study was blood plasma samples from 140 pregnant women living in Kindia prefecture and N’Zerekore prefecture, as well as 60 male partners who reported sexual contact with HIV-infected persons. The samples were examined for the presence of serological (HBsAg, HBeAg, antibodies anti-HBs IgG, anti-HBcore IgG, anti-HBe IgG, anti-HCV IgG, Ag/Ab-HIV) and molecular (HBV DNA, HCV RNA, HIV RNA) markers.Results and discussion. The age of the examined pregnant women ranged from 13 to 55 years and was on average (26.29±9.67) years. The age of men varied from 15 to 60 years, on average – (29.05±11.99) years. When assessing the prevalence of serological markers, antibodies to HCV were detected in 2.14 % cases in women and in 3.33 % cases in men. Antibodies to HIV were found in 6.43 % and 6.67 % women and men, respectively. Serological markers associated with HBV were detected in 80.71 % (HBsAg – 13.57 %) of women and 81.67 % (15 %) of men. In the pregnant women, HCV RNA was not detected, HIV RNA was revealed in 1 case, HBV DNA was identified in 26 cases (18.57 %), including 5 % HBsAg-negative hepatitis B cases. In the men group, HCV RNA and HIV RNA were detected in 3.33 % and 6.67 % cases, respectively. HBV DNA was determined in 16.67 % of men, including latent hepatitis B in one person. A significantly higher incidence of HIV in men compared to women is shown (χ2=3.907 at p