Cover figure courtesy of Petrogiannis-Haliotis et al: Parvovirus B19 infection, serologically confirmed; bone marrow biopsy specimen. A 43-year-old man, status post renal transplant, on immunosuppressive therapy, presents with persistent anemia (hematocrit level: 23% to 25%). The figure shows virally infected erythroblasts from giant pronormoblasts (arrows) with faintly eosinophilic or clear nucleoplasm and large eosinophilic inclusions. No normal-appearing erythroid cells were seen. (Hematoxylin & eosin stain, original magnification × 100, oil emersion. Courtesy of T. Petrogiannis-Haliotis, B. Sherburne, F. Evangelista, R. Monahan, I. Oliff, P. Gross, and M.E. Kadin; Beth Israel Deaconess Medical Center, Boston, MA 02215.)