KEY CONCEPT Some viral diseases can be prevented with vaccines.

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Presentation transcript:

KEY CONCEPT Some viral diseases can be prevented with vaccines.

Viruses cause many infectious diseases There are many examples of viral infections. common cold

- common cold influenza

common cold influenza SARS

The body has natural defenses against viruses. HIV HIV-infected white blood cell The body has natural defenses against viruses.

Vaccines are made from weakened pathogens. A vaccine stimulates the body’s own immune response. Vaccines prepare the immune system for a future attack. Vaccines are the only way to control the spread of viral disease.