Ultrastructural and cytochemical identification of peroxisomes in Balantidium coli, Ciliophora

Peroxisomes of the trophozoites of Balantidium coli isolated from pig intestine content were investigated, using ultrastructural and cytochemical techniques. The peroxisomes of B. coli trophozoites from pigs with subclinical balantidiasis are less then 0.8 mm in diameter whereas those from pigs with acute balantidiasis are greater than 0.8 micron in diameter. In all the trophozoites peroxisomes are round, oval or dumb-bell shaped. Catalase as an indicative enzyme was detected by cytochemical techniques in B. coli peroxisomes.