BBC: A vaccine for cancer-2

To recap, some cancer treatments work by unblocking our blocked natural defences, whereas(while) vaccines retain the immune system to find and attack cancer cells naturally. Because these two apporoaches are quite different, they can be used together and individually. 

So, to answer my original question, Neil, a vaccine for cancer might not be too far away. But how about your question- isn't it time you revealed the answer?

I asked which disease was first successfully treated by a vaccine?

And I said polio. Was I right?

You were wrong, I'm afraid. The correct answer was C, which is smallpox. OK, let's recap the vocabulary we've learned in this programme, starting with breakthrough, a sudden, dramatic and important discovery. 

A number of something means several, or many and can add credibility to what you say. 

The phrase, Nothing to see here! is used to discourage people from paying attention or looking too closely at soemthing, or to move them away. 

If you hijack something, you use something that does not belong to you for your own benefit. 

Being blind to something means failing to notice it or recognize it as a threat. 

And finally, to re-educate means to teach somebody to think or behave in a new or different way.