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Infectious Diseases. What is an Infectious Disease?. Any disease that is caused by an agent that has invaded the body. These are caused by: Person to person contact Food and water Animals Something in the environment. Person to Person Contact. Sneezing Coughing Sharing Drinks.

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what is an infectious disease
What is an Infectious Disease?
  • Any disease that is caused by an agent that has invaded the body.
    • These are caused by:
      • Person to person contact
      • Food and water
      • Animals
      • Something in the environment
person to person contact
Person to Person Contact
  • Sneezing
  • Coughing
  • Sharing Drinks
food and water
Food and Water
  • Contaminated food
    • Example: Salmonella
  • Contaminated water
    • Drinking from streams and lakes
  • From animal bites we can get rabies, malaria, lymes disease, West Nile etc.
  • Pathogens that are present on most of the objects around you.
    • Door handles
    • Phones
all infectious diseases are caused by a pathogen
All infectious diseases are caused by a pathogen.
  • A pathogen is any agent that causes disease.
    • Examples:
      • Bacteria
      • Viruses
      • Fungi
      • Protozoan
      • Parasites
  • A tiny single cell organism that lives everywhere on earth.
    • Examples:
      • tuberculosis, tetanus, sinus infection
    • Treatments:
      • Antibiotics (which prevent growth and division of bacteria.
  • A disease causing particle made of genetic material and a protein coat.
    • Examples: Chicken pox, flu, measles, colds, AIDS
    • Treatment: Medication to treat the symptoms and prevent further production in human cells.
bacteria versus viruses
Bacteria versus Viruses
  • Bacterial infections: Can be treated with antibiotic
    • Examples: strep throat, sinus infections
  • Viruses: Can only treat the symptoms. Some viruses just have to run their course.
    • Examples: flu, cold, mumps, measles, hepatitis
bacterial diseases
Bacterial Diseases
  • Strep throat
  • Tuberculosis
  • Sinus infection
  • Malaria
  • Tetanus
viral diseases
Viral Diseases
  • Common cold
  • Influenza (flu)
  • Cold sores
  • Warts
  • Mononucleosis
  • Chicken pox
  • AIDS
  • Organisms that absorb and use nutrients of living or dead organisms.
    • Examples: athletes foot, ringworm, yeast infections
    • Treatment: over the counter meds or prescription
  • Single celled, microscopic organisms.
    • Leading cause of death in some parts of the world.
      • Example: malaria
      • Prevention: good hygiene and health
  • Get energy and nutrients from feeding on other things.
    • Examples: Head lice, tape worm, lymes disease
how does your body fight diseases
How does your body fight diseases?
  • Physical Barriers: skin, mucous membranes
    • Consider these to be like a defensive line

Inflammatory Response: reaction to injury or infection that is characterized by pain, redness, swelling.

    • This would be the linebackers

If the pathogen makes it past your immune system and score a touchdown, you are now officially sick!