1. Bacteria, Viruses, & Other Agents of Disease

2. Disease Transmission Airborne Vector-borne Oral transmission
Droplet contact
Indirect contact
Direct contact

3. Pathogens Bacteria Viruses Protists Fungus Worms Prions
Ex: Tuberculosis, staph infection
Viruses
Ex: HIV, small pox, herpes
Protists
Ex: Malaria, sleeping sickness
Fungus
Ex: Candidiasis (yeast infection), valley fever
Worms
Tapeworm, hookworm
Prions
CJD, Mad cow

4. Antibiotics
Antibiotic resistance
Only work on bacteria – not viruses!

5. Viruses Not alive! DNA or RNA wrapped in protein coat
Reproduce by hijacking cells
Viral DNA is inserted into host DNA
Host cell produces virus proteins
Virus self-assembles and attacks new cells

7. HIV HIV infects & destroys Helper T cells (CD4 cells)
Disease is tracked by T cell count
<200/µl is considered AIDS
Test for HIV using ELISA