Gene Editing BA.4/BA.5 mutations reduced responsiveness of epitope-specific T cells with original mRNA vaccine Posted on January 2, 2023 by Editorial Staff 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. Share on FacebookTweetFollow us Editorial Staff Underlying genetic cause for MIS-C complications after COVID-19 identified Why do some people develop persistent lung sequelae after severe COVID-19?