1. Pathogens

2. Virus

3. Bacteria Single cell organisms. Can be cured with anti-biotic. Ex. Strep throat, E-coli infection.

4. Fungal Single or multi cell organisms. Can be treated with anti fungal medication. Can also be used to help make some meds (anti-biotic, toxins) Ex. some rashes like thrush, athletes foot.

5. Protozoa Single-celled parasites living and multiplying in the body. The general term for these parasites is protozoa. Protozoa enter the body through the mouth or skin. Protozoa that enter through the mouth usually do so through unclean water or food. Protozoa that enter through the skin usually do so through an insect bite. Treated with various medications and even surgery, results vary.

6. Transmission How you get a pathogen or how you get sick Direct Person to person most common way Std's are spread Animal to person Mom to Unborn child- through the placenta or during labor Indirect Droplet transmission- cough or sneeze. Only go about 3 feet Particle transmission- smaller than droplets can stay in the air for extended periods of time and travel through air currents.

7. Vaccines Biological preps that improve immunity to a virus. They usually contain a small amount of the virus (Active) or something that can resemble the virus (Latent). Vaccines stimulate the immune system and give it the ability to recognize and destroy the virus if it encounters it later.