1. Bacteria, Viruses, Fungi, Protists & Parasites
Pathogens
Bacteria, Viruses, Fungi, Protists & Parasites

2. What is an infectious agent or pathogen?
Infectious agents are organisms that enter the human body and effect its ability to maintain homeostasis (i.e. makes you sick).

3. Bacteria Round/Sphere-shaped, rod-shaped, or spiral- shaped
Some have flagellas to help them move
Food: parasitic, decomposer, photosynthesis, or consumer
Unicellular
Prokaryote (no nucleus)
Reproduction: fission, conjugation
Consists of cytoplasm and DNA surrounded by a cell membrane and a cell wall.

4. Examples
Botulism
Tuberculosis
Pneumonia
Meningitis
E. Coli
Salmonella

5. Think Pair Share
How do we get rid of a bacterial infection?

6. Viruses
Strand of DNA or RNA surrounded by a layer of protein that can infect and replicate in a host cell.
Not considered living
Unicellular
Crystal, cylinder, sphere, and bacteriophage shapes
Food – parasitic
Active or Latent

8. Examples
Rabies
HIV
Influenza
Chicken pox
Common cold

9. Think Pair Share
How can we treat or prevent viruses?

10. Protists Eukaryote (has nucleus)
Animal-like – consumers; unicellular; move with cilia, flagella, or pseudopod (Paramecium)
Plant-like – photosynthesis; uni or multi-cellular; move with flagella (Algae)
Fungus-like – decomposer; multicellular; do not move (slime mold)
Asexual & sexual reproduction

11. Protists

12. Examples
Malaria
Giardiasis

13. Think Pair Share
How can we determine whether the protest is plant- like, animal-like, or fungus-like?

14. Fungus Multi-cellular Decomposer or Parasitic
Use hyphae to absorb food
Club, sac, imperfect or zygote fungi
Asexual or sexual reproduction using spores

15. Examples
Athlete’s Foot
Diaper Rash

16. Think Pair Share
What are the best conditions for athlete’s foot or diaper rash to develop?

17. Parasites
Flatworms – like tapeworms
Arthropods – like lice, ticks, and mosquitos

18. Think Pair Share
How do these pathogens affect the body’s ability to maintain homeostasis?