PI3Kδ hyper-activation promotes development of B cells that exacerbate Streptococcus pneumoniae infection in an antibody-independent manner

Antibody mediated immune responses to Streptococcus pneumoniae are crucial for the immune response to infection. Here the authors show hyper-activation of PI3Kδ promotes development of a subset of B cells that exacerbate infection in an antibody-independent manner and can be reversed by therapeutic targeting in vivo.