Make up a large part of the plankton of the oceans All algae contain chlorophyll and carry on photosynthesis
Typanosomes – Causes African Sleeping sickness. Generalized pain, weakness, cramps and swelling of neck lymph nodes. Parasites invade all organs of the body including heart and CNS. The latter leads to apathy, mental dullness, tremors, convulsions and sleepiness, coma. There is rapid weight loss and death a few months later from malnutrition, heart failure, pneumonia or a parasitic infection.
Trypanosoma cruzi in blood smears, Giemsa stain. but can present with manifestations that include fever, anorexia, lymphadenopathy, mild hepatosplenomegaly, and myocarditis. Most acute cases resolve over a period of 2 to 3 months into an asymptomatic chronic stage. The symptomatic chronic stage may not occur for years or even decades after initial infection. Its manifestations include cardiomyopathy (the most serious manifestation); pathologies of the digestive tract such as megaesophagus and megacolon; and weight loss. Chronic Chagas disease and its complications can be fatal.
Trichomoniasis - Parasite
This is an example of infectious diarrhea due to Giardia lamblia infection of the small intestine. Transmitted by contaminated food and water. The small pear-shaped trophozoites live in the duodenum and become infective cysts that are excreted. They produce a watery diarrhea. A useful test for diagnosis of infectious diarrheas is stool examination for ova and parasites.