Entamoeba coli (Grassi)
Synonymy.—Endamoeba coli, Amoeba coli [Kirby, 1945].
Natural vectors.—Blaberus atropos, Venezuela (Tejera, 1926): In a lot of 60 cockroaches captured in latrines, two were found that carried apparently live cysts similar to cysts of E. coli.
Blattella germanica or Periplaneta americana, Egypt (DeCoursey and Otto, 1956, 1957): One out of 44 cockroaches collected in a village harbored E. coli.
Experimental vector.—Periplaneta americana, Gold Coast Colony (Macfie, 1922): In nine experiments cysts of E. coli were fed to the cockroaches. In seven of the experiments cysts of E. coli were found in the feces. Cysts were observed in the feces for only one to three days, and eventually disappeared completely. The cysts appeared to be unharmed. No amoebae were found.