Lecture 5 BILD - Lecture 5 July 9 th Cast of Characters...

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Unformatted text preview: Lecture 5 July 9 th Cast of Characters & Terms Viruses, bacteria, protists Platyhelminthes Trematodes: flukes; Cestodes: tapeworms Nematodes: roundworms Annelids: polychaetes, oligochaetes, leeches Molluscs: snails Arthropods: crustaceans, insects (incl. fleas, flies, mosquitoes, lice), spiders (incl. ticks, mites) Vectors: insects, ticks, mites, snails, birds, mammals Hosts: intermediate and final Reservoirs and commensals Zoonoses: human disease of animal origin. (zoonotic) Parasitism: most popular life style on earth Parasite pathogenicity, prevalence, morbidity, mortality Bilateria 3 groups Lophotrochozoans Platyhelminthes Molluscs Annelids Ecdysozoans Nematodes Arthropods Deuterostomes Turbellaria - flatworms Trematoda - flukes Cestoda - tapeworms PLATYHELM INTHES: Turbellaria: free-living flatworm Planaria: common freshwater flatworm is < 1 inch long PLATYHELM INTHES: Trematoda: flukes ADULT SCHISTOSOMES BLOOD FLUKES -250 million people Male in groove on female, < 10 mm long PLATYHELM INTHES: Cestoda: tapeworms Adults in mammal gut -Taenia saginata: cattle, T. solium: pigs OLIGOCHAETES/ POLYCHAETES ANNELIDA: SEGMENTED WORMS HIRUDINEA: leeches OTHER PARASITIC WORMS: Nematodes: roundworms p. 683 C. elegans - Caenorhabditis elegans is a soil-dwelling model organism Acanthocephalans : thorny-headed worms (p. 668: affect host behavior) Nemertea : ribbon or proboscis worms (p. 668) Nematomorpha : horsehair worms (not in Campbell) NEMATODA: ROUNDWORMS ACANTHOCEPHALANS: thorny-headed worms, affect host crab behavior). Aquatic insects to rats to pigs NEMERTEA: ribbon or proboscis worms bootlace worm grows to 100 ft! NEMATOMORPHA: horsehair worm emerging OLD ADVERTISEMENT FOR FILTERED WATER, LONDON, ENGLAND INFECTIOUS DISEASES (millions of cases/yr) Prevalence Mortality Diarrheal 5,000 10 Respiratory ? 5 Malaria 900 2 Schistosomiasis 250 <1 Whooping cough* 70 0.3 Tuberculosis 1,000 1 Tetanus* 0.1 0.1 Diptheria* 40- Hookworm 900- Trypanosomiasis 12- Ascariasis 1,000 - Measles 85 1 *Diptheria, Pertussis, Tetanus = DPT inoculation DISEASES AND RECENT HUMAN HISTORY Fall of Athens: 429 BC - 1/4 of army dies (unknown disease) Fall of Rome : 165180 AD: Antonine plague kills 1/4 of pop. (probably smallpox or measles), led to rise of Christianity 251 AD: 1/3 of population dies (?measles) 542 AD: Justinian plague (bubonic) ex India decimated Rome & Persia allowing Muslim armies to sweep the Mediterranean Japan 808 AD: bubonic plague kills 1/2 population Source: McNeill, W. Plagues and peoples Europe : 13461350: the black death or great plague: 3050% of Europeans died Americas 1492: introduction of diseases from Europe killed ~60 million Amerindians. 90% within 50 years, 95% within 100 yrs....
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Lecture 5 BILD - Lecture 5 July 9 th Cast of Characters...

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