Dysentery Protist
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Transcript of Dysentery Protist
Protists Section 3
Protists and Disease
• Protists have significant effects on humans and other organisms.
• They can cause disease and alter ecosystems, and they are useful in industry and research.
• Protists cause a number of human diseases, including giardiasis, amebiasis, toxoplasmosis, trichomoniasis, cryptosporidiosis, Chagas disease, and malaria.
Protists Section 3
Most common human parasites
• Protists– Single-celled microbes– Can live on its own, or as a
parasite– Can live in intestines
without problems– Dangerous if in blood or
body tissue– Transmitted fecal-mouth, or
through a invertebrate vector (mosquito, tick)
Entamoeba histolytica casues amebic dysentery
Protists Section 3
Diseases Caused by Protists
Protists Section 3
Most common human parasites
• Helminths (worms)– Flatworms (tapeworms),
Thorny-headed worms, Round worms
– Only larvae reproduce in humans, not adult worms
– Often passed between animals and humans (eggs, not worms!)
25-foot tapeworm on display at the Tokyo Parasite Museum.
Protists Section 3
Ectoparasites
• Attach to skin for long periods of time
• Often vectors (carriers) of other pathogens
An adult louse; actual size is about as big as a sesame seed.
The “kissing bug” is a vector for Trypanosoma cruzi, a protist that causes Chagas disease.
Protists Section 3
Protists and Disease, continuedMalaria
• Treatment for malaria is inexpensive, but not always available.
• Plasmodium is developing resistance to many drugs, so treatment is becoming more difficult.
• Efforts to control malaria include distribution of insecticide treated mosquito nets and fumigation to kill mosquitoes.
• Research is also underway to develop a malaria vaccine.
• Learn more on p. 509
Protists Section 3
Life Cycle of Malaria