1. Viruses

2. What is a virus? microscopic, nonliving particle microscopic, nonliving particle Invades and then reproduces inside a living cell. Invades and then reproduces inside a living cell.

3. Characteristics Virus are not living. Virus are not living. Shapes: rod, round, spikey Shapes: rod, round, spikey

4. How viruses multiply 1) Attaches to a cell 2) Injects DNA into cell 3) Takes over cell parts 4) Makes copies using cell parts 5) Breaks open the cell (cell dies) 6) Repeats on other cells Watch the flu virus invade a cellvirus

5. Viral Diseases AIDS AIDS Chicken pox Chicken pox Influenza Influenza

6. Viral Diseases Measles Measles Polio Polio Rabies Rabies

7. Treatment for viruses No medications can cure viral infections. No medications can cure viral infections. Over-the-counter medications can treat symptoms. Over-the-counter medications can treat symptoms.

8. Preventing Viruses Vaccine – prevents spread of some viral diseases. Vaccine – prevents spread of some viral diseases. Made from a dead or weakened virus. Made from a dead or weakened virus. This helps the body recognize the live virus when it comes in. Now it will be ready to attack it before it makes you sick. This helps the body recognize the live virus when it comes in. Now it will be ready to attack it before it makes you sick.