Figure 3: T.S of Biomphalaria alexandrina snails exposed to Schistosoma mansoni miracidia: left panel (6hr post exposure), right panel (72hr post exposure). A&B: snails from SBSC, C&D: Giza snails, A&C: the normal miracidium “Mi” (arrows) in tentacle and mantle; note absence of hemocytes response, B&D: normally developing elongated sporocyst “Sp” (arrows) in headfoot region. E&F: Fayoum snails. E: miracidium “Mi” (arrows) in head-foot region surrounded by few hemocytes “H”, F: active infiltration around the sporocyst “Sp” which is surrounded by several layers of flattened hemocytes “H” in the head-foot region at the basement of the tentacle germinal cell (GC); tegument (T) (h & e) (x 400).