A, Placental chorionic villi with chronic granulomatous inflammation with multinucleated giant cells (hematoxylin-eosin stain, magnification ×200); B, Chorionic villus with necrotic remnants of Toxoplasma organisms (hematoxylin-eosin stain, magnification ×400). C, Same villus with positive reaction (brown) to Toxoplasma antibody (immunohistochemical stain, magnification ×400). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)