1. Diseases Caused by Bacteria and Viruses
Chapter 20 Section 3

2. In this section… How do bacteria cause disease?
How do viruses cause diseases?
Why are emerging diseases particularly threatening to human health?

3. General Definitions Pathogens-disease causing agents
Vaccine-a preparation of weakened or killed pathogens
Antibiotic-drugs that block the reproduction and growth of bacteria.
Emerging Disease-a first time disease seen in a population, or a disease that become harder to treat.
Prion-a protein that can cause neurological damage.

4. Disease Mechanisms
Two ways
Damaging tissue
Releasing Chemicals

5. Host Tissue Damage Like TB-Tuberculosis
Pathogen is inhaled and triggers an immune system response
Begins damaging tissue

6. Releasing Toxins Like the bacteria that causes diphtheria
Deadly Food Poising

7. Controlling Bacteria Physical Removal Disinfectants Food Storage
Food Processing
Sterilization by heat

8. Preventing a Bacterial disease
Use of a vaccine
Edward Jenner Video
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9. Preventing Disease
Vaccines
Antibiotics

10. Viral Diseases
Viruses cause disease by directly destroying living cells or affecting cellular processes, upsetting homeostasis.

11. Preventing Viral Diseases
Prevention:
Vaccines
Personal Hygiene

12. Treating Viral Diseases
Antibiotics don’t work
Antiviral Drugs

13. Emerging Diseases
These pathogens can have a huge affect on humans…we haven’t built up a resistance yet, and have no way to control them.
Superbugs
New Viruses

14. Prions Clumps of proteins that cause problems.
Means protein infections particle
Affect humans and animals.