Dr. Samah Mohammed

Course Code: NUR 240

Introduction to microbial and

infectious diseases

2014 - 2015

Out lines 1. Define microbiology?

2. Define infectious disease?

3. Define communicable disease?

4. Discuss types of microorganism?

Microbial World And You

What is Microbiology?• Microbiology is the study of microorganisms.Micro: too small to be seen with the naked eye (cannot seen by naked eye).

Bio : life

ology : study of.

What are Microorganisms?Also called as Microbes are minute living things that individually

are usually too small to be seen with the unaided eye.

An organism that can be seen only with the aid of a microscope.

a. Microorganisms are found everywhere in the world, in all

living things, plants and animal, on and inside your body, than

there are cells that make up your entire body.

b. Microorganisms can live in the air, on land, and in fresh or salt

water environments.

c. Some of them are pathogens, can be harmful and causes

diseases, but majority of microorganisms beneficial for us.

Microorganisms - what comes to mind?

What are groups of Microorganisms?

1. Bacteria

2. Protozoan's

3. Algae

4. Parasites

5. Fungi

6. Viruses

A. Bacteriology

B. Protozoology

C. Phycology

D. Parasitology

E. Mycology

F. Virology

Types of Microorganisms

1. Bacteria: are unicellular organisms. Because they have no

nucleus, the cells are described as prokaryotic.

2. Fungi: (mushroom, and yeasts) with a true nucleus. Most fungi are

multicellular. Fungi obtain nutrients by absorbing organic material

from their environment.

3. Protozoa: are unicellular. Protozoa obtain nourishment

by absorption or ingestion through specialized

structures.

4. Algae: are unicellular or multicellular that obtain

nourishment by photosynthesis.

6. Viruses: are non cellular entities that are parasites of

cells. Viruses consist of a nucleic acid core (DNA or

RNA) surrounded by a protein coat

Types of Microorganisms

Infectious disease

Definition:

1. Infectious disease: any infection caused by microbes or parasites.

2. Communicable disease: infection transmitted from persons or animals to other persons.

Goal of studying infectious disease

- To study etiology, epidemiology, pathogenesis,

clinical manifestations, treatment and prevention

of infectious diseases.

- To control and eliminate these diseases.

(occurrence, spreading, prevention)

Any Question

Answer the following questions

What is Microbiology?

What are Microorganisms?

Enumerate types of Microorganisms?

Fill the missing spaces :-

1-Science deal with the study of Bacteria is called------,Virus is called----------,with the

Fungus ------------ and with Algae is called-----------.

2- Bacteria are ------------ organisms. Because they have -------------, the cells are

described as prokaryotic.

3-True cells include…………………….