Blastocystis Hominis is a microscopic parasite found throughout the world in the stools of people who have abdominal pain, diarrhoea or gastric disorders. The infection is 'Blastocystosis'. Blastocystis Hominis gets into the intestinal tract through oral-fecal contact, such as when a person preparing food doesn't wash hands thoroughly after using the toilet. Travellers often pick up Blastocystis Hominis in countries with lower standards of sanitation and personal hygiene. Wash your hands!