Page 284 - New Medley 5 Semester 2

with smallpox germs. The boy did not show any sign of the smallpox

disease. This led to the development of a vaccine for smallpox. Vaccines
can prevent diseases from occurring. Today, smallpox is not a dreadful

disease as it was once considered to be.

Nowadays, vaccines are easily available for diseases like tuberculosis,

diphtheria, tetanus, whooping cough, typhoid, cholera, polio and others.
The vaccination of children against such diseases is now popular throughout

the world.

Louis Pasteur, a French scientist, found harmful

germs in water, milk and other food products. These
germs can cause serious diseases in the human body.

Louis Pasteur found that these germs can be killed if
milk or water is boiled at a very high temperature.

This method of killing germs in food articles is called
Pasteurisation. The milk, which we buy from the

market in polypacks, is pasteurised milk. This can
help in preventing diseases. Louis Pasteur

• Critical thinking

Cross () the wrong statement.

1. The stethoscope was discovered by Fahrenheit.

2. A microscope helps make a small thing look big.

3. Alexander Fleming discovered penicillin.

Basic Health Care

We can keep ourselves healthy and strong by following certain precautions

in our daily life. We can help our children by adopting healthy habits.
Some of them are as under:

1. Keep your environment clean and free from pollution.

2. Drink only clean water and always keep the food covered.

3. Eat nutritious and balanced diet.

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