ABSTRACT
The Spike protein is one of the virulence factors of viruses, which is responsible for the attachment of the virus to the host cell. This study included the study of the effect of Favipiravir on S protein at different concentrations, as it showed the highest effect at a concentration of 0.5 and an amount of 9.66 ± followed by the concentration. .025 by 7.06 ± to have a gradual effect of (5.23 ±, 3.63 ± 2.53 ±, 1.60 ±, 0.06 ±, 0.00) at a concentration of (0.015, 0.03, 0.06, 0.125, 0.07, 0.02), respectively, as once the virus interacts with the cell The host causes a structural rearrangement of the S protein, which allows the virus to fuse with the host cell membrane. Because of the seriousness of the Covid-19 virus and its components, it has become necessary to find a drug that controls the spread of the pandemic. [ FROM AUTHOR] Copyright of Egyptian Academic Journal of Biological Sciences, C Physiology & Molecular Biology is the property of Egyptian Academic Journal of Biological Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full . (Copyright applies to all s.)