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VIRUSES
What living things do you see in this picture?
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What are the characteristics of living
organisms?
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Characteristics of living organisms
Maintain homeostasis Reproduction Cellular organization Metabolism (use energy) Contain genetic information
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What about viruses?
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Like Living Organisms:
•Replication •Contain Genetic Information
•Viruses are not made of cells• They cannot make proteins by themselves•and They cannot use energy
Like Non-Living Organisms:
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How are viruses transmitted?
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Airborne
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Contaminated food or water
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Vectors or infected animal bite
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Sexual contact
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Contaminated blood products
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Some Diseases caused by Viruses
Polio Chicken Pox Measles Rabies Mumps Influenza
Smallpox Hapatitis Yellow Fever AIDS Ebola
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Vaccines
Definition Preparation of
killed or weakened pathogens introduced into the body to produce immunity.
Why do vaccines NOT protect against all viral diseases? Vaccination is effective
only against viruses with non-varying proteins on their surfaces. If the surface proteins
mutate often the new changes are not recognized by the immune system.
Examples: Colds, Flu, and HIV