FIG. 1.

(a) Photomicrograph of a 21-day placenta from C. callosus, showing the labyrinth area (L), the region of giant trophoblastic cells (arrowhead), spongiotrophoblasts (asterisk) and decidua (d). Bar, 1.57 μm. (b) Photomicrograph of the neutrophil containing T. gondii after 13 days of infection, assayed by immunohistochemistry using alkaline phosphatase (arrow). Bar, 4.61 μm. (c) Electromicrograph of T. gondii cells at the materno-placental interface, after 14 days of infection, showing a group of parasites (✻) at the maternal blood vessel. Bar, 1.85 μm. (d) Electromicrograph of T. gondii (P) cells attached at the surface of giant trophoblastic cells (T). Bar, 0.71 μm. (e) Electromicrograph of T. gondii (P) cells partially internalized in a giant trophoblastic cell (T) after the 15th dop and infection. Bar, 0.71 μm.