Question

Describe 5 harmful effects of protozoans in humans.

Answer 1

Hint:Single-celled eukaryotic heterotrophic organisms basically use organic carbon as a source of energy. Many protozoan infections are responsible for diseases that affect plants, animals, humans, etc.

Complete answer
To answer this question, we have to know details about diseases. The abnormal condition in our body due to which we have some negative effects in our body function and structure without any external injury is considered as disease. Diseases are the medical conditions that have some specific signs and symptoms.
The localized diseases affect in some particular part of the body, the disseminated disease harm in many areas of the body, and systemic diseases affect the entire body. Every disease has an etiology but in some cases the origin is not easy to find out even through diagnosis. Some of the diseases harm the chemical balances in the neurons that may cause some neurological symptoms. Diseases are categories under autoimmune, blood, bacteria, digestive, nerve, cancer, heart, and sexual transmission.
Diseases may be communicable and non communicable, in communicable it can move from person to person and in non communication it cannot spread through physical touching. There are diseases that are considered as chronic diseases that means it is very contagious to our body and it remains inside the body for a long duration.

Additional information:
1. Entamoeba histolytica causes amoebiasis and can lead to ulcers in colon
2. Giardia lamblia causes Diarrhea and leads to loose bowels.
3. Trypanosoma species causes Trypanosomiasis that are flagellate parasites affect the blood plasma and results in sleeping sickness.
4. Leishmaniasis is caused due to Leishmania species that cause affect to skin sores and
spleen enlargement.
6. Chagas Disease occurs due to infection by Trypanosoma cruzi. results (30–40%) in cardiomyopathy, causes progressive myocardial damage and heart disease as it moves to Chronic from asymptomatic acute phase.
7. Toxoplasmosis occurs due to obligate intracellular protozoan Toxoplasma gondii. Humans usually become infected by horizontal transmission through the consumption of cysts found in contaminated meat.

Note:Many of the most prevalent and deadly human diseases are caused by a protozoan infection, including African Sleeping Sickness, amoebic dysentery and malaria.
Eg: Chagas disease is also termed as American trypanosomiasis.