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Lecture 23

Biology 1201A Lecture Notes - Lecture 23: Birdwatching, Phagocytosis, Respiratory Tract


Department
Biology
Course Code
BIOL 1201A
Professor
Jennifer Waugh
Lecture
23

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March 30, 15
Defenses Against Disease
Measles is a highly contagious disease
It aects the lungs

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Defense against disease began with smallpox
Milkmaids were generally immune to smallpox if they previously
had cowpox (similar disease – less severe)
Edward Jenner (1796)
- Inoculated an 8 year old boy with cowpox - caused mild
infection
- Inoculated boy with smallpox - remained infection free
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Vaccination has eradicated smallpox
Technique of infecting with a similar but less severe form of
pathogen
- Evolved to modern vaccinations
oWeakened live pathogen
oInactivated pathogen
oEmpty pathogen (i.e. viral protein coat)
All take advantage of the immune system
3 lines of defense
First line – Barriers
Prevents pathogens from entering the body
- Physical (skin, mucous membranes, cilia)
- Chemical (Lysozyme, digestive enzymes)
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