Microorganisms, Infectious Diseases

By: Alex Covington


8.L.1.1 Summarize the basic characteristics of viruses, bacteria, fungi, and parasites relating to the spread, treatment and prevention of disease.

8.L.1.2 Explain the difference between epidemic and pandemic as it relates to the spread, treatment and prevention of disease

What is Microbiology?

Microbiology is the study of microscopic organisms, such as bacteria, fungi, archaea, viruses, and protozoa.

Student friendly: The branch of science that deals with microorganisms.

The 4 most known Pathogens


Q:What are those?

A: Viruses are non-living organisms that are small and they can change mutate.

Q: How do they work?

A: They infect a host cell and replicates to cause illness and disease

Q: What are some examples of a virus?

A: Herpes, AIDS, and the Chicken Pox


Q: What is that?

A: Bacteria- single-celled prokaryotes that can cause disease, multiplies rapidly, and can form colonis.

Q: How do they work?

A: They reproduce by binary fusion. The cell grows, copies its DNA or RNA, stretches, then splits into two identical cells.

Q: What can bacteria cause?

A: It can cause Salmonella, Salmonella is a type of food poisoning.


Q: What is that

A: Fungi is a single-celled or multi-cellular organism,

Q: How does it work?

A: It can decompose or absorb organic matter.

Q: What are some example of fungi?

A: Yeast, mold, or mushrooms.


Q: What is that?

A: An organism that lives in or on another organism, called a host.

Q: How does it work?

A: It takes nutrients from the host, often harming it in the process.

Q: What are some examples of a Parasite?

A: Tapeworms, fleas, and barnacles.

Outbreak, Epidemic, Pandemic

  • Outbreak- Occurrence of a disease greater than would be expected at a particular time and place.
  • Epidemic- An outbreak of a disease that affects many people in an area of a specific country or region.
  • Pandemic- An epidemic that spreads over a very large are or throughout the entire world.

Vocab Words

Vector- An organism (Typically an insect) that transmits disease

Pathogen- A virus, bacteria, fungi, parasite, or protozoa that can cause illness or infection

Protozoa- Diverse organisms that cannot be classified as animals, plants or fungi.