‘HEALTH IS WEALTH’ . Health is wealth as this well known

Adage says good health considered to be

The greatest wealth. In living things diseases are caused by various factors.

IN this unit you will learn the following;

1.Nature and cause of diseases .

2. Immunisation.

3. Importance of Hygiene.

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When the human body lacks adequate nourishment, it becomes weak and is

Easily susceptible to infectious diseases. To

Protect ourselves from infections, we should

Get vaccinated.This preventive measure is

Known as immunisation.

The majority of the diseases are caused

By virus & bactriea, which are called pathogens. Diseases like cholera, plague,

I

1.PRIMARY IMMUNISATION :

The administration of one or more

Than one type of vaccine by injecting it

Into body, to create the necessary resistance

Is called primary immunisation.

2. SECONDARY IMMUNISATION:

By administering the vaccine again,

A short time after the primary immunisation,

Permanent resistance is developed. This is

Called secondary immunisation.

The combined effect of the well being of mind,

Body and society is total health such a health human being performs his daily duties exceedingly

Well. His relationship with his family and his interaction

With society will be harmonious.

A person can lead a healthy life only when he

Keeps his food, clothes, shelter and the surroundings

Clean.