NOD1 and abortion: -B. abortus 2308-induced abortions and placentitis mediated, in part, by the ER-stress response through the NOD1/2-mediated unfolded protein response.-B. abortus 2308 ∆vceC (an effector molecule involved in the induction of ER stress within Brucella-infected cells) induces reduced abortion and placentitis levels without affecting placental bacterial burden.