Vaccinations....please help me with this question...

please can anybody explain me how vaccinations can be done against viral diseases....I know vaccination can be done for small pox , rubeola etc. but how ....
And various internet source I found that there is vaccination against chickenpox....even I know that the vaccine is called varicella....but in my text book it is written that vaccination doesn't protect against chickenpox (source: trueman's elementary biology by k n bhatia and m p tyagi)...please help with this question also.....

We partly deactivate the virus. By heating it, we cause the proteins inside to unfold, and they don't fold back again exactly as they were. (This, by the way, is the same thing that happens when you cook an egg.)

This stops the virus from being fully effective in infecting you, but enough of it is still intact that your immune system is fully trained to react to the real virus.

The textbook is in error. The varicella vaccine does protect against chicken pox. That's what it is for. If you take the vaccine after you are exposed to chicken pox but before you develop the lesions, the vaccine will mobilize your immune system enough against the virus that you have about a 90% chance of not getting chicken pox. Of course, if you get the vaccine before you are exposed, the protection is nearly 100%.

I don't know how Lisa go an A. The virus is deactivated enough that it cannot replicate in your body, so you do not get sick from it.

Golly....lies & bullshit CAN'T be posted ONLINE,right?
Books NEVER contain mistakes,right?

Sorry, the human immune system does not vaccinate against viruses.
It just doesn't.
In some cases, like chickenpox, once you get the disease, you never get it that specific disease again -- however, varicella stays in your body forever, and if you get stressed enough at a ripe old age, it comes back. As shingles, for which there is no treatment, you simply have to wait for the disease to take its course.