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Disease Communicable Disease – Pathogen

Communicable Diseases. is an illness. Passed from one person to another. - An illness caused by a pathogen. Disease Communicable Disease – Pathogen. is a disease carrying organism. Communicable Diseases. Disease Carrying Pathogens Viruses

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Disease Communicable Disease – Pathogen

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  1. Communicable Diseases is an illness. Passed from one person to another - An illness caused by a pathogen. Disease Communicable Disease – Pathogen is a disease carrying organism.

  2. Communicable Diseases • Disease Carrying Pathogens • Viruses • Programmed to infect only certain body cells • Directs infected cell to produce more viruses • E.G. – common cold, measles, chickenpox, and influenza.

  3. Disease Carrying Pathogens • Bacteria • Single-celled microorganisms • In excess of 1000 types of bacteria of which only about 100 cause diseases • E.G. – strep throat, tuburculocis (TB), E.coli, pnuemonia, and Lyme disease.

  4. Disease Carrying Pathogens • Rickettsia • Grow inside living cells and resemble bacteria • Much smaller than bacteria • E.G. – Rocky Mountain spotted fever and typhus

  5. Disease Carrying Pathogens 4. Fungi • Single-celled or multicelled plantlike organisms, such as yeast and molds • Cause diseases of the skin, mucous membranes, and the lungs • E.G. – athletes foot, ringworm, jock itch, and nail infections

  6. Disease Carrying Pathogens • Protozoa • Tiny, single celled parasites • E.G. – malaria, disentery

  7. Defense…Defense… Defense Against Diseases • Skin – unbroken skin prevents pathogens from entering the body. • Tears, Saliva, and Perspiration – contain chemicals that kill pathogens. • Mucous Membranes – secrete mucous that trap and destroy pathogens • Stomach Acids – when pathogens are swallowed they are killed by stomach acids.

  8. Defense…Defense… Defense Against Diseases • Fever – the higher temperature is an unfavorable environment for many pathogens to live. • Immune system response • T cells – WBC that regulate the action of the immune system • Phagocytes – WBC that surround and kill pathogens by ingesting • B cells – cells that produce antibodies (proteins that help fight infection)

  9. Defense…Defense… Defense Against Diseases • Active immunity – antibody resistance from vaccines • Passive immunity – antibodies from blood transfusion defend against pathogens – short term – only when development of disease in imminent

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