Dysentery Protist
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- Pages: 7
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
Diseases Caused by Protists
Section 3
Protists
Section 3
Most common human parasites • Helminths (worms) – Flatworms (tapeworms), Thorny-headed worms, Round worms – Only larvae reproduce in humans, not adult worms
25-foot tapeworm on display at the Tokyo Parasite Museum.
– Often passed between animals and humans (eggs, not worms!)
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, continued Malaria • 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
Life Cycle of Malaria
Section 3
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
Diseases Caused by Protists
Section 3
Protists
Section 3
Most common human parasites • Helminths (worms) – Flatworms (tapeworms), Thorny-headed worms, Round worms – Only larvae reproduce in humans, not adult worms
25-foot tapeworm on display at the Tokyo Parasite Museum.
– Often passed between animals and humans (eggs, not worms!)
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, continued Malaria • 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
Life Cycle of Malaria
Section 3
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