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Published byIsaac Clarke Modified over 9 years ago
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Viruses A virus is a NON-Living particle made of DNA or RNA and a protein coat. Look at table 25-1 on p. 487 in text book. VERY small. ~ 0.001micron
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Viral Replication Because they are not cells they can’t replicate on their own. Intracellular parasites. They invade a host cell and use that cell to reproduce.
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Lytic Cycle
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Viruses and Human Disease H1N1 HIV Common Cold Chicken Pox Measles Mumps Polio Rabies Hepatitis Small Pox West Nile Mono
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Prevention and Treatment Antiviral drugs drugs that interfere with virus replication. There are very few antiviral drugs so they are not commonly used. Vaccines are used to prevent viral infections.
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Immunity When you are in contact with a virus your white blood cells create what are called antibodies. Antibodies are disease-fighting proteins located on the cell membrane. If you come in contact with this exact same virus again your body will recognize it and destroy it.
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Vaccines Helps the body's own defense system prevent a disease by producing antibodies against it. Vaccines use a weakened or killed version of the virus. Researchers may spend years working on a vaccine. They have still not succeeded against HIV or against malaria, but they are trying. Not all vaccines offer long-term protection. The tetanus vaccine, for example, offers protection for only about ten years. Then a person must be immunized again. Some vaccines are made with animal material. For example, influenza vaccine is grown in chicken eggs. This can be a problem for people who are allergic to eggs.
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