AUTHOR=Akther Shangida , Samiha Fairoz , Sony Sabrina Amita , Haque Mohammad Anamul , Hasnat Mohammad Abul , Islam S. M. Saiful , Ahmed Shamim , Abdullah-Al-Shoeb Mohammad TITLE=Assessment of serum biomarker changes following the COVID-19 pandemic and vaccination: a cohort study in Sylhet, Bangladesh JOURNAL=Frontiers in Public Health VOLUME=Volume 13 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/public-health/articles/10.3389/fpubh.2025.1435930 DOI=10.3389/fpubh.2025.1435930 ISSN=2296-2565