WHAT IS BYSTANDER IMMUNITY? Besides the cross reactivity effect, the anti-Flu immune responses can induce “bystander immunity”, according to researchers citing a previous study in the journal "Cell", titled “Memory B cell activation, broad anti-influenza antibodies, and bystander activation revealed by single-cell transcriptomics”, published in January 2020. They also hypothesized that cross-reactivity could augment immunity, though “non-specifically”, against other viral infection, such as SARS-CoV-2.
AP