APOPTOTIC DEFENSIVE WALL. “Apoptosis, induced in infected cells by cytotoxic immune effector cells, is a critical defence against intracellular pathogens. Despite this cell-mediated immunity, many viral, bacterial and protozoan pathogens have developed mechanisms to invade and multiply within host cells without inducing apoptosis.”
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2958.2007.05714.x/full