1. DISEASE
Unit C – Science 24

2. What are we studying in this unit . . .
Why do people get sick? (Section 9)
How does disease affect society? (Section 10)
How do we protect ourselves from disease? (Section 11)
Why are our genetics important? (Section 12)

3. What are we studying today…
DISEASE CAUSING MICROBES
PATHOGENS
BACTERIA
VIRUSES
PROTISTS
FUNGI

4. BACTERIA = Bacteria are everywhere!
They are on your skin, in your mouth, in the air you breathe, and in the food you eat.
But they are so small you can’t see them
the good side =
Lactobacillus

5. staphylococcal orbital cellulitis
the bad side
GINGIVITIS –
Bacterial Plaque
Rickettsia rickettsii (Rocky Mountain spotted fever)
staphylococcal orbital cellulitis
STAPH BACTERIA INFECTION

6. What do you think Bacteria needs to grow?
WARM TEMPERATURE
FOOD (i.e. SUGAR, FAT) ?
YEAST DEMO
MOISTURE

7. Viruses AIDS Are much smaller than bacteria.
They reproduce by taking over cells in the body, quickly multiplying and then invading other body cells.
AIDS

8. Giardia – which causes Beaver Fever
PROTISTS
Are single-celled organisms that share some characteristics with both animals and plants.
Some protists cause serious diseases such as:
Giardia – which causes Beaver Fever
(Named this because Beaver’s often carry the protist that causes nausea, fever, diarrhea, etc.)

9. MALARIA The genus of protist known as Plasmodium causes malaria
Estimated to kill a million people a year in the sub-Saharan Africa.

10. FUNGI
Includes molds, yeasts and mushrooms. They cannot make their own food by photosynthesis so they are parasites and can live only on host organisms.
the good side

11. FUNGI
the bad side
ATHLETE’S FOOT
RINGWORM

12. So how do these pathogens spread?
GET INTO GROUPS OF 2-3, brainstorm and make a list of as many ways you can think of that pathogens (bacteria, viruses, protists and fungi) can spread

13. Can you fit all of your ideas into these categories
Contact through a wound
Airborne
Can you fit all of your ideas into these categories
Direct Contact
Contact with a carrier
Water-borne
Carried in food

14. COMMUNICABLE DISEASES
Illnesses that can be spread from one organism to another
Illnesses that cannot be spread from one organism to another
NON- COMMUNICABLE DISEASES

15. Heart Disease Cancer Flu Meningitis AIDS Cystic Fibrosis Alzheimer's
Decide in a group of 2-3 whether the following are communicable or non-communicable.
Heart Disease
Cancer
Flu
Meningitis
AIDS
Cystic Fibrosis
Alzheimer's
Down syndrome
Botulism
Common Cold
Malaria
Rabies
Liver Disease
Malnutrition

16. Why do we get non-communicable diseases?
Environment – exposure to pollutants
Allergies, cancers, emphysema
Diet – poor diets (malnutrition, heart disease)
Malnutrition, heart disease, high blood pressure
Lifestyle – smoking, alcohol, lack of exercise
Cancer, Liver disease, Anorexia, Obesity
Genetics – genetic diseases, from your parents
Down syndrome, cystic fibrosis, muscular dystrophy

17. SUMMARY QUESTIONS See if you can answer the following:
What is a pathogen?
Is AIDS a bacteria, virus, protist or fungi?
What is a non - communicable disease?
Name 2 ways you can get a communicable disease?