On the cover: Listeria monocytogenes (LM) infection prevents cardiac allograft acceptance. Histology of acutely rejected cardiac allografts, harvested on 8–10 days post-transplantation, from mice treated with anti-CD154/donor-specific transfusion (DST) and infected with LM on the day of transplantation (H&E staining: original magnification, ×200). Wang, T., L. Chen, E. Ahmed, L. Ma, D. Yin, P. Zhou, J. Shen, H. Xu, C.-R. Wang, M.-L. Alegre, and A. S. Chong. 2008. Prevention of allograft tolerance by bacterial infection with Listeria monocytogenes.J. Immunol. 180: 5991–5999.