COVID-19 vaccine is one of four advanced mRNA-based vaccines, which is a nucleoside-modified mRNA (modRNA) vaccine encoding an optimized full-length version of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike (S) protein. It is designed to induce immunity against SARS-CoV-2, the virus responsible for causing COVID-19. The modRNA is formulated in lipid nanoparticles for administration via intramuscular injection in two doses, three weeks apart.
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Mechanism of action:
Tozinameran contains nucleoside modified mRNA (modRNA) encapsulated in lipid nanoparticles that deliver the modRNA into host cells. The lipid nanoparticle formulation facilitates the delivery of the RNA into human cells.12 Once inside these cells, the modRNA is translated by host machinery to produce the SARS-CoV-2 spike (S) protein antigen, which is subsequently recognized by the host immune system. Tozinameran has been shown to elicit both neutralizing antibody and cellular immune responses to the S protein, which helps protect against subsequent SARS-CoV-2 infection.7,8
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