Samieefar, Noosha, Ronak Rashedi, Meisam Akhlaghdoust, Melika Mashhadi, Pouya Darzi, and Nima Rezaei. “Delta Variant: The New Challenge of COVID-19 Pandemic, an Overview of Epidemiological, Clinical, and Immune Characteristics”. Acta Biomedica Atenei Parmensis 93, no. 1 (March 14, 2022): e2022179. Accessed August 17, 2024. https://mattioli1885journals.com/index.php/actabiomedica/article/view/12210.