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VOICE-OVER: Bacteria and 
viruses can make you ill.

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When you catch a disease, like measles, 
you build up an immunity to that disease.

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This helps prevent you 
from catching it again.

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Vaccines are a way to build up immunity
without getting ill first.

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A vaccine contains a weakened type 
or small parts of a virus or bacteria.

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Your body responds to the vaccine 
by making antibodies.

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That way, if you are later exposed 
to the real virus or bacteria...

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your body will recognise it and 
quickly make extra antibodies.

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As a result, you’ll not get ill or will be 
less ill than you would be otherwise.

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Sometimes, more than one dose 
of a vaccine is needed to achieve this.

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The viruses or bacteria in a vaccine are 
either dead or too weak to make you truly ill.

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Sometimes, there are side effects 
after receiving a vaccine...

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such as a sore arm or a fever.

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These symptoms usually 
go away after a day or two.

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After that, you will be better 
protected against the disease.