occurs in in taxon Schistosoma mansoni 7 week parasitic worm stage Schistosoma mansoni worm stage Schistosoma mansoni 7 week worm stage A 7 week worm stage of Schistosoma mansoni that is the mature stage of Schistosoma mansoni and found in the small inferior mesenteric blood vessels surrounding the large intestine of the definitive host 7 weeks after weeks after infection. Priti Parikh S. mansoni 7 week worm stage Jie Zheng Chris Stoeckert Mammalia mesenteric vein Mammalia intestine