Bacteria-like endosymbionts in Blastocystis sp. International Journal
for Parasitology 24: 147-149. Bacteria-like endosymbionts were found i
n vacuolar cells and cysts of Blastocystis sp. from duck and monkey fa
ecal material. The organisms ultrastructurally resembled Gram-negative
bacilli, and were present in the nucleus of Blastocvstis sp. from the
duck and in the cytoplasm of Blastocystis sp. from the monkey. Based
on size and differences in intracellular location, it is probable that
these represent two distinct species of organisms.