RE: Covidity25 Mar 2022 11:57
I hope that you get well soon Burble.
I have just read a very interesting article on T-Cell responses to Covid 19. Covidity definitely appears to be on the right path:-
https://www.science.org/doi/10.1126/sciimmunol.abo1303
“Mounting evidence suggests T-cell contributions to the host immune response are required for early, broad, and durable protection from SARS-CoV-2, especially in the setting of new variants of concern (VOC).”
“The durability of the T-cell response is still under investigation; however, robust SARS-CoV-2-specific CD4+ and CD8+ T cell responses have been observed up to one year post infection and at least six months post vaccination (6, 20, 21). Also, as previously shown, memory T cells to SARS-CoV-1 have been detected 17 years after exposure, suggesting that T cells may provide durable protection against severe COVID-19 disease.”
“As viral variants continue to evade host immune defenses, a second generation of vaccines or novel, tailored boosters may be necessary to enhance immunity to future SARS-CoV-2 VOC. The rapid rise in the prevalence of the heavily spike-protein-mutated Omicron variant in South Africa and across the globe, and the Delta subvariant AY.4.2 in the UK (48), serve as an important reminder that variants will continue to emerge, resulting in decreased efficacy of the humoral response generated by previous infection with ancestral strains or vaccination. Furthermore, SARS-CoV-2 spike protein is capable of inducing host cell fusion, allowing cell-to-cell viral transmission that is refractory to antibody neutralization (49). These findings underscore the importance of cellular immunity and T-cell recognition of viral variant epitopes and the cytotoxic clearance of virally infected cells. A thorough understanding of the T-cell response is needed to design the next generation of vaccines that target a broad spectrum of SARS- CoV-2 antigens recognized by T cells.”