102Chapter8 - Chapter 8: Environmental Health and...

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Chapter 8: Environmental Health and Toxicology The Environment is Out to Kill You
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8.1 Environmental Health The global disease burden is changing Infectious and emergent diseases still kill millions of people Conservation medicine combines ecology and health care Resistance to drugs, antibiotics, and pesticides is increasing Who should pay for health care?
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Pathogens Prions (Mad Cow, Kreuzfeld-Jacob) Viruses (Ebola, AIDS, smallpox, common cold, influenza, herpes) Bacteria (cholera, typhoid, plague) Protista (malaria, sleeping sickness, Giardia ) Fungi (athlete’s foot, yeast infections, Candida ) Multicellular Organisms (tapeworms, trichinosis, schistosomes)
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Prions Only known infectious agents without DNA Misconfigured protein molecules Bind to normal proteins and convert them to misconfigured form All known prion diseases attack the brain No known cure; invariably fatal; very nasty
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Viruses Viruses are non-living but reproducing Viruses invade cells and use cell reproduction mechanisms to reproduce Retroviruses permanently insert new DNA into cell (AIDS) Viruses cannot be attacked in cells Being non-living, can’t be killed by antibiotics in blood stream Only defenses are immunization or prevention
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Promiscuous Antibiotics Used improperly against viral infections
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This document was uploaded on 12/31/2011.

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102Chapter8 - Chapter 8: Environmental Health and...

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