Gcse /Igcse biology 2-Communicable disease

Communicable diseases

What you will learn

Understand general characteristics of diseases

Understand different Bacterial diseaese

Understand different Viral diseases

Understand different protists diseaese

Understand different fungal diseaeses

Get know role of vectors in transmitting diseaeses


A communicable disease is one that is spread from one person to another through a variety of ways that include: contact with blood and bodily fluids; breathing in an airborne virus; or by being bitten by an insect.

A communicable disease is a disease that spreads from one person or animal to another. Pathogens such as viruses, bacteria, and fungi cause these diseases.

There are four main types of pathogens cause infection:

Viruses, bacteria, fungi, and Protists.


Viruses are tiny pathogens that contain genetic material. Unlike other pathogens, they lack the complex structure of a cell.

To replicate, they must enter the cells of other living beings. Once inside, they use the cell’s machinery to make copies of themselves.


Bacteria are microscopic, single-celled organisms. They exist in almost every environment on earth, including inside the human body.

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Many bacteria are harmless, and some help the body to function. However, bacteria can also cause infections that damage the body.


Fungi are a type of organism that includes yeasts, molds, and mushrooms. There are millionsTrusted Source of different fungi. However, only around 300 cause harmful illnesses.

Fungal infections can occur anywhere in the body. However, they commonly affect the skin and mucus membranes.


Protists are microscopic organisms that typically consist of a single cell.

Some Protists are parasitic, meaning they live on or inside another organism and use the organism’s nutrients for their own survival. Parasitic Protists can cause various diseases.



Introduction in communicable diseases

Course overview
Introduction into cCommunicable diseases
Categories of pathogens
How pathogens spread

Viral Diseases

Introduction into viruses
Symptoms of measles
Treatment and prevention of measles
How measles Spreads
HIV (Human immunodeficiency Virus)
Symptoms of HIV
Treament and Prevention of HIV
How HIV spreads
Quiz on HIV
Tobacco mosaic virus (TMV)
Symptoms of TMV
Treatment and Prevention of TMV
How TMV spreads
Quiz on TMV

Bacterial diseases

Introduction into bacteria
Pattern of bacteria growth
Symptoms of Salmonella
Treatment and prevention of salmonella
How salmonella spreads
Quiz on salmonella
Symptoms of gonorrhoea
Treatment and prevention of gonorrhoea

Fungal diseases

Introduction into fungi
Rose Black spot disease
Symptoms of Rose black spots disease
Treatment and prevention of Rose black spot
How Rose Black spot spreads
Quiz on Rose Black spot

Protist diseases

Life cycle of plasmodium
Symptoms of malaria
Treatment and prevention of malaria
How malaria spread

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