18.3 Viral Diseases KEY CONCEPT Some viral diseases can be prevented with vaccines.

18.3 Viral Diseases Viruses cause many infectious diseases

• There are many examples of viral infections.

– common cold Rhinovirus over 100 different types

18.3 Viral Diseases Viruses cause many infectious diseases

• There are many examples of viral infections.

– common cold – influenza

18.3 Viral Diseases Viruses cause many infectious diseases

• There are many examples of viral infections.

– common cold – influenza – SARS

18.3 Viral Diseases Viruses cause many infectious diseases

• There are many examples of viral infections.

– HIV • The body has natural defenses against viruses.

HIV-infected white blood cell

18.3 Viral Diseases

A substance that stimulates the body’s own immune response against invasion by microbes.

• Made from a weakened form of the virus itself.

• Triggers the body’s immune system to produce antibodies • Memory cells “remember” the virus so future attacks can be prevented.

• Measles • Mumps • Rubella • Influenza • Chicken Pox • Hepatitis • Meningitis • Polio • Small Pox (not used anymore) • HIV (Aids) • Common cold • West Nile Virus