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Lecture - Mycotoxins and Protozoa

Lecture - Mycotoxins and Protozoa - CDC Questions 1 2 3 4...

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Click to edit Master subtitle style CDC Questions: 1. Diarrheal diseases are more common in the summer than the winter? 2. Most foodborne illnesses are due to germs of animal origin. 3. Salmonella is the most common cause of hospitalizations due to foodborne illnesses. 4. Food & water contaminated with pathogenic microorganisms are the major environmental sources of gastrointestinal illnesses.
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Pathogenic Protists Prokaryotes vs. Eukaryotes vs. Archea Single celled Eukaryotes = protists (protoctista, protozoa, protophyta) Phylum for protists: Apicomplexa = Cryptosporidia, Cyclospora, Toxoplasma , Isopora Sarcomastigophora (flagellates, amoeba) = Giardia, Entamoeba Ciliophora (cilliates) = Balantidium Microspora Fungi: Aspergillus and Penicillium Dinoflagellates = Toxic algae Diatoms = Toxic algae
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Protozoan life cycles Trophozoite : motile, metabolically active stage Schizont : asexual stage, makes multiple daughter cells Merozoites : daughter cells Gametocytes : sexual stage Zygote : product of gametocytes Oocyst : resistant stage, produces trophozoites OR Sporozoite Trophozoite Schizont Merozoite s Gametocyte s Zygote Oocyst Sporozoite
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C=conoid m=microneme dg=dense granules n=nucleus r=rhoptries pv=vacuole
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Very small Apicomplexan (3-5μm): Parasites of mammals, birds, reptiles and fish Usually from contaminated water Colonizes epithelial intestinal cells Clinical presentation: Mostly self-limiting mild diarrhea Opportunistic disease: serious with immuno-compromise
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