CD8A and viral infectious disease: However, several RNA-Seq data sets have suggested that FcγRIIB is expressed within CD8+ T cell populations (21, 22); and although a 2014 study demonstrated protein expression by flow cytometry of FcγRIIB on CD8+ T cells in response to microbial and viral infections (23), the functional significance of FcγRIIB on CD8+ T cells was unclear.