Roundworm-Schistosoma (Skin-Swimmer’s Itch)
Schistosomiasis, also known as bilharziasis, swimmer’s itch or snail fever, is caused by the larvae of blood flukes known as schistosomes. Direct contact with fresh water infested with the free-living form of the parasite known as cercariae. The building of dams, irrigation systems, and reservoirs, and the movements of refugee groups introduce and spread schistosomiasis. Eggs are excreted in human urine and feces and, in areas with poor sanitation, contaminate freshwater sources.
Protozoa-Blastocystis
Once thought to be a harmless yeast, Blastocystis hominis a microscopic single-celled protozoal parasite. It behaves like a tiny animal — hunting and gathering other microbes for food—one reason why having a balanced gut flora is important. Healthy gut floras do not support large amounts of parasites. Many protozoa inhabit your gastrointestinal tract and are harmless; others cause disease.
Protozoa-Microsporidia (Water)
Microsporidia Spores are oval in shape but are difficult to differentiate from bacteria because they are so small. Identification of spores in feces is actually possible with a modified trichrome stain that stain spores in red. What is Microsporidia? Microsporidia are protozoal parasites of animals and insects responsible for common diseases of crustaceans and fish, and have been found in most other animal groups, including humans. Microsporidia are obligate, intracellular, spore-forming protozoa known to infect many animals. They are very ancient. Intestinal infection with Enterocytozoon bieneusi is increasingly recognized in patients with AIDS and chronic diarrhea where the prevalence is about 23-33%.