Early Access Annals of Clinical and Biomedical Research Original Article The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries should be directed to the corresponding author for the article. All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher. ISSN 2724-508X https://pagepress.org/medicine/acbr/index Publisher's disclaimer. E-publishing ahead of print is increasingly important for the rapid dissemination of science. The Early Access service lets users access peer-reviewed articles well before print / regular issue publication, significantly reducing the time it takes for critical findings to reach the research community. These articles are searchable and citable by their DOI (Digital Object Identifier). Annals of Clinical and Biomedical Research is, therefore, e-publishing PDF files of an early version of manuscripts that have undergone a regular peer review and have been accepted for publication, but have not been through the typesetting, pagination and proofreading processes, which may lead to differences between this version and the final one. The final version of the manuscript will then appear in a regular issue of the journal. E-publishing of this PDF file has been approved by the authors. All legal disclaimers applicable to the journal apply to this production process as well. Annals of Clinical and Biomedical Research 2023 [online ahead of print] To cite this article: Joanah M. Ikobah, Mbang Ada, Kelechi Uhegbu, et al. Viral hepatitis B and C infections in adolescents born pre- and post-hepatitis B vaccine introduction in Calabar, Nigeria. Annals of Clinical and Biomedical Research. 2023;4:321. doi:10.4081/acbr.2023.321 ©The Author(s), 2023 Licensee PAGEPress, Italy