1. Infectious Diseases

2. 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

3. Person to Person Contact • Sneezing • Coughing • Sharing Drinks

4. Food and Water • Contaminated food • Example: Salmonella • Contaminated water • Drinking from streams and lakes

5. Animals • From animal bites we can get rabies, malaria, Lymes disease, West Nile etc.

6. Environment • Pathogens that are present on most of the objects around you. • Door handles • Phones

7. All infectious diseases are caused by a pathogen. • A pathogen is any agent that causes disease. • Examples: • Bacteria • Viruses • Fungi • Protozoan • Parasites

8. Bacteria • A tiny single cell organism that lives everywhere on earth. • Examples: • tuberculosis, tetanus, sinus infection • Treatments: • Antibiotics (which prevent growth and division of bacteria.

9. Viruses • 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.

10. 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

11. Bacterial Diseases • Strep throat • Tuberculosis • Sinus infection • Malaria • Tetanus

12. Viral Diseases • Common cold • Influenza (flu) • Cold sores • Warts • Mononucleosis • Chicken pox • AIDS

13. Fungus • Organisms that absorb and use nutrients of living or dead organisms. • Examples: athletes foot, ringworm, yeast infections • Treatment: over the counter meds or prescription

14. Protozoans • Single celled, microscopic organisms. • Leading cause of death in some parts of the world. • Example: malaria • Prevention: good hygiene and health

15. Parasite • Get energy and nutrients from feeding on other things. • Examples: Head lice, tape worm, lymes disease

16. How does your body fight diseases? • Physical Barriers: skin, mucous membranes • Consider these to be like a defensive line

17. Inflammatory Response: reaction to injury or infection that is characterized by pain, redness, swelling. • This would be the linebackers

18. Immune system: Contain certain types of blood cell and antibodies. • Safety

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