In Vitro and In Vivo Anti-blastocystis Efficacy of Olive Leaf Extract and Bee Pollen Compound

Background: Blastocystis is the most common enteric protozoa in humans and animals worldwide. The hazardous side effects and potential development of drug resistance to the standard drug, metronidazole (MTZ), necessitate the search for safer and more efficient alternative therapeutics. Objective: The present study was designed to investigate the in vitro activity and in vivo efficacy of two natural medicinal compounds, Olive Leaf Extract (OLE) and Bee Pollen Compound (BPC) against subtype 3 Blastocystis isolated from symptomatic patients. Materials and Methods: Cultured parasites were challenged with a graded concentration of OLE (500, 1000 g mLG 1 ), BPC (500, 1000 g mLG 1 ) and MTZ (150, 250 g mLG 1 ) to assess its in vitro growth by counting the number of viable cells after one and two h of incubation and morphological ultrastructural changes were evaluated using Transmission Electron Microscope (TEM). The anti-Blastocystis effects of OLE and BPC were determined in 40 laboratory bred Swiss albino mice inoculated with Blastocystis isolates using parasitological, histopathological and immunohistochemical methods. Results: Blastocystis isolated from symptomatic patients were subtype 3. The OLE and BPC showed statistically significant (p<0.05) in vitro growth inhibition of Blastocystis in a concentration dependent manner and a statistically significant (p<0.05) in vivo reduction of the number of Blastocystis in stool samples and intestinal contents of infected treated mice higher than MTN effects with apoptotic-like death and Programmed Cell Death (PCD) in Blastocystis.