EESA01H3 Lecture 4: Biological hazards and human health
17 Feb 2017
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Document Summary
Human body is a habitat and host to many organisms. Associations that harm or bother us are infectious diseases; agents are pathogens. Zoonosis infectious disease transmissible to humans from other animals influenza, rabies, anthrax, zoonosis. The human boy is host to many small organisms because it offers sheltered conditions. Pathogens infectious agent established in a host organism. Worms parasitic multicellular infections and diseases. Protozoa unicellular - parasitic bigger than bacteria. Organized single celled aerobic vs anaerobic some form spores (survive inhospitable conditions and dry environments) until conditions become optimum. Viruses on strand of dna or rna parasitic. Prions are proteins found on the surface of normal nerve cells of some mammalian species including humans weak and flexible structure whereas the abnormal prion has a rigid structure and is nearly indestructible. When established in the brain, the abnormal prions produce a set of degenerative brain illnesses (encephalopathies) makes a disease called. Approximate relative size of protozoan, bacterium and virus.
