https://www.news-medical.net/news/20230102/BA4BA5-mutations-reduced-responsiveness-of-epitope-specific-T-cells-with-original-mRNA-vaccine.aspx
A new study in the journal Viruses examines the phenomenon of breakthrough infections due to the evasion of T-cell immunity by the Omicron BA.4/BA.5 subvariants, showing this to be due to spike gene mutations.
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