Viruses

1. How Viruses are Spread

2. Human Immune System

3. How to Help prevent the Spread of Viruses

3.1. Personal Hygene

3.1.1. Daily Habits

3.1.1.1. Doctor's Care

4. Vaccines

4.1. History

4.1.1. How vaccines work

5. Tracking a Virus and Labeling

5.1. Outbreak

5.1.1. Epidemic

5.1.1.1. Pandemic

6. Physical characteristics

7. Living Organsisms

7.1. Virus vs. Bacteria

8. Nonliving Particles

8.1. reproduction of viruses

9. Active virus multiplication

10. Hidden Virus Multiplication