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Human Impact By Protozoans

Human Impact By Protozoans. By Vik Lal & Yaveth Gomez. Protozoans. General Characteristics. Unicellular Organisms that sometimes form colonies Come in many shapes and sizes Animal like heterotrophic unicellular organisms Specialized vacuoles that take in and transport food

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Human Impact By Protozoans

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  1. Human Impact By Protozoans By Vik Lal & Yaveth Gomez

  2. Protozoans

  3. General Characteristics • Unicellular Organisms that sometimes form colonies • Come in many shapes and sizes • Animal like heterotrophic unicellular organisms • Specialized vacuoles that take in and transport food • Gain water by osmosis • Asexual reproduction • Eukaryotic • Take in nutrients through diffusion, phagocytosis, and transportation

  4. Amoeba • Move by extending cytoplasm • Feed by phagocytosis • Consume algae, bacteria, and other protozoans • One example of a disease-causing protozoan is entamoeba histolytica, which causes amebic dysentery

  5. Flagellates • Contain a flagellum (allows movement) • Diseases cause by flagellates: • Giardiasis • Tricamonhas infection • African sleeping sickness

  6. Ciliates • Tiny hairlike structures • Beat in a rhythmic fashion • Covers surface of cells • Balantidium causes diaria (only ciliate that causes diesease) • All soluble nutrients are absorbed in the cell • All residue is eliminated

  7. Sporozoans • These are parasites that live inside a host, where the cause disease • Contain no structures for movement • Most common are species of plasmodium • Causes Malaria

  8. Diseases

  9. Entanmoeba histolytica • Causes amebic dysentery • Infects predominantly humans and other primates • Cause infections when swallowed • Infections can last for years • No symptoms • Transmitted by ingestion of contaminated water or food • Is not “uncommon” in tropics and arctics • Amoeba usually remains in the gastrointestinal tract of the hosts • All people have the potential of becoming infected • Filtration is the most practical method for recovery

  10. African Sleeping Sickness • Caused by Trypanosomiasis • Can be contracted in Western and Central Africa • Is caused through the bite of an infected fly (tsetse) • If left untreated, death will occur • Symptons include: fever, rash, swelling around the eyes, hands, severe headaches, extreme fatigue, aching muscles, etc. • There is no vaccination available • On the average, 20,000 cases are reported each year worldwide

  11. Balantidium Coli • A parasite of many species of animals • Causes diarrhea • Can be infected through contaminated water or food • Locates in the large intestine • Invades the mucosa

  12. Malaria • Leading cause of death and disease in many countries • Passed by mosquitoes from one human to another • Parasites grow and multiply in humans • Symptoms: -fever -chills -sweats -vomiting, nausea • This disease is typically curable • 41% of the world's population is exposed to malaria • Malaria causes more than 300 million episodes of acute illness every year • At least one million deaths occur every year due to malaria.

  13. THANK YOU

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