Immunisation 5th
What’s happening here? Why do mum and dad take babies to have needles and cause pain? What do you think? Why do people say immunisation is good for you? Lets try and understand why.
In this picture what can you see In this picture what can you see? What is there that you cannot see because they are so small
Germs are so small that you cannot see them- Revise last lesson There are so many different types Revise TB germ Diarrhoea germ Wound germ and how they spread
They are all around us and on our hands also
What is happening Senthil eating with his Laddu. Can he see them What is happening Senthil eating with his Laddu? Can he see them? Why not? We are going to see what happens when these horrible germs get inside our body.
Our body has many organs. Can you name some on this picture
Our body also has many blood vessels carrying blood pumped by the heart to all parts of the body. Can you see blood vessels on the teachers hands? On your hands
Blood looks red. But inside blood there are many living things that are very small- like germs you cannot see them. These are the white and red blood cells. With blood these cells travel everywhere.
Can you see the white blood cells in Senthil’s body?
When white cells see germs inside the body they fight the germs When white cells see germs inside the body they fight the germs! The white cells are like soldiers in our body! They keep us healthy. Which is the white cell? What’s it doing?
When the germs Senthil ate with the laddu get inside his body, the white cells will fight the germs. Bit these germs are strong!! Who won this fight?
When germs win the fight with white cells we become sick – like Senthil! Some germs are so strong they can make us very sick and kill us.
Many years ago there was a sad scientist called Pasteur because many children were being killed by strong germs. He realised that the white cells of the body were too weak to fight these germs. Why can’t you see them? because they are too small!
But Pasteur had an idea. He took some strong germs and kept them in a bottle. He then heated it till it became weak! But not dead
He then injected this weak germ in to a healthy child He then injected this weak germ in to a healthy child! Was he mad or clever?
The white cells in the child’s body kills the weakened germ The white cells in the child’s body kills the weakened germ. Why was the germ weak?
When the white cells in the baby’s body realise there is danger outside what will they do? What will you do when there is a danger outside your house? What are they doing in this picture?
Now look what these trained white cells do to strong germs also Now look what these trained white cells do to strong germs also! Does Senthil fall ill now?
Why did not Senthil fall ill even though strong germs entered his body?
Vaccination trains our white cells to be strong by injecting weak germs inside our body!
Immunisation is painful but is it good to immunise Immunisation is painful but is it good to immunise? Do you immunise babies after they become sick or before? Why? In the next lesson we will look at the kind of diseases immunisation prevents