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ENSC 200 (19)
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Lecture

Diseases

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Department
Environmental Studies
Course
ENSC 200
Professor
Prof.
Semester
Fall

Description
What is disease?  A disease is defined as a physical or mental disorder or malfunction with a characteristic set of signs or symptoms.  Diseases may be caused by a single factor such as a pathogenic microorganism or be multifactorial and have many causes some of which may depend on lifestyle. Pathogens  Pathogenic microorganisms include bacteria, viruses and fungi.  Each pathogen has a specific method by which it causes disease. Some such as the influenza virus damage host cells whereas others, such as Vibrio cholera produce toxins which have a harmful effect on the body.  The ability of the pathogen to cause disease depends on o Location - what tissue is colonised o Infectivity - how easily a bacterium can enter the host cell o Invasiveness - how easily a bacterium or its toxin spreads wit
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