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KEY CONCEPT Some viral diseases can be prevented with vaccines.

KEY CONCEPT Some viral diseases can be prevented with vaccines. Viruses cause many infectious diseases. There are many examples of viral infections. common cold. Viruses cause many infectious diseases. influenza. There are many examples of viral infections. common cold.

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KEY CONCEPT Some viral diseases can be prevented with vaccines.

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  1. KEY CONCEPT Some viral diseases can be prevented with vaccines.

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

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

  4. Viruses cause many infectious diseases • influenza • There are many examples of viral infections. • common cold • SARS

  5. HIV-infected white blood cell Viruses cause many infectious diseases • HIV • There are many examples of viral infections. • The body has natural defenses against viruses.

  6. 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.

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