Viruses.

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Presentation transcript:

Viruses

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

Viruses are Nonliving Viruses are not cells Viruses do not: Use energy Grow Respond to their surroundings Make food Produce wastes

How viruses multiply Attaches to a cell Injects genetic material into cell Takes over cell parts Makes copies using cell parts Breaks open the cell Repeats on other cells

Viral Diseases AIDS Chicken pox Influenza

Viral Diseases Measles Polio Rabies

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

Preventing Viruses Vaccine – prevents spread of some viral diseases. Made from a dead or altered virus. If the virus enters the body, it is destroyed before it can produce disease.