The COVID-19 pandemic has become the most devastating pandemic of the 21st century since its appearance in December 2019. Like other RNA viruses. continuous mutation is common for coronavirus to create several variants and subvariants. The main reason behind this mutation and evolvement of SARS-CoV-2 was its structural spike (S) glycoprotein. https://safeersappliancers.shop/product-category/bosch-hba5780s0b-built-in-single-oven-stainless-steel-60cm/