Transcript Disease

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Remember:
• A pathogen is a micro-organism that has the potential to
cause disease.
• An infection is the invasion and multiplication of
pathogenic microbes in an individual or population.
• Disease is when the infection causes damage to the
individual’s vital functions or systems.
• An infection does not always result in disease!
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To make us ill microbes must:
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reach their target site in the body
attach to the target site they are trying to infect
multiply rapidly
obtain their nutrients from the host
avoid and survive attack by the immune system
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Infection enters through:
1. Natural openings in your body
• Eyes – hand to eye in tear duct to mucus
• Mouth – attaches to teeth swallow kills most
• Nose – infect mucus membranes
2. Directly infect your skin
3. Take advantage of breaks in skin
4. Bug bites
5. Animal bites
6. Penetrate skin
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Infection enters through:
1. Natural openings in your body
2. Directly infect your skin
•Bacteria - Staphylococci, coryneforms
•Fungi - athlete’s foot, ringworm
•Viruses - wart viruses live in dead skin cells
3. Take advantage of breaks in skin
4. Bug bites
5. Animal bites
6. Penetrate skin
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Infection enters through:
1. Natural openings in your body
2. Take advantage of breaks in skin
• Cuts
• Catheters
• Burns
3. Bug bites
4. Animal bites
5. Penetrate skin
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Infection enters through:
1.
2.
3.
4.
Natural openings in your body
Directly infect your skin:
Take advantage of breaks in skin
Bug bites
• Bacteria
• Parasites
• Viruses
5. Animal bites
6. Penetrate skin
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Infection enters through:
1.
2.
3.
4.
5.
Natural openings in your body
Directly infect your skin:
Take advantage of breaks in skin
Bug bites
Animal bites
• Rabies
6. Penetrate skin
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Infection enters through:
1.
2.
3.
4.
5.
6.
Natural openings in your body
Directly infect your skin:
Take advantage of breaks in skin
Bug bites
Animal bites
Penetrate skin
• Swimmers itch – larval worms in water
• Hook worm – larval worms in soil
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Reproduction
• Bacteria – divide
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Reproduction
•Virus - uses host
Aids virus budding from a
white blood cell.
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The Defenders
1. First line of defence
– Skin
– Muscus membranes
2. Second line of defence
3. Third line of defence
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The Defenders
1. First line of defence
2. Second line of defence
– White blood cells
3. Third line of defence
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The Defenders
1. First line of defence
2. Second line of defence
3. Third line of defence
– Immune response, antibody
creates antigens which
engulf and digest the
invader
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Questions
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