Sarcocystis: development in cultured avian and mammalian cells.

Sarcocystis, a protozoan that parasitizes muscle tissue of reptiles, birds, and mammals, including man, developed in avian and mammalian cell cultlures. Mctile banana-shaped organisms, released from cysts in grackle muscle, entered cells and transformed into enlarged ellipsoid or oblong stages, which developed into either multinucleate or cyst-like stages, or both.