Vaganova, Anastasia, Elena V. Semenova, and Andrei V. Ivanov. “Anti-SARS-CoV-2 Seroprevalence in Northwestern Russia in 2020-2024”. Global Biosecurity 7, no. 1 (August 29, 2025). Accessed October 15, 2025. https://jglobalbiosecurity.com/index.php/up-j-gb/article/view/330.