Antigentic Variation?

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I have been asked to create a presentation on antigenic variation covering the following topics;

define

what happens when viruses demonstrate antigenic variation

how does this variation come about

implications

I know the definition and  what happens but am struggling on the second two - my text book is being really helpful and telling me very little, the internet isn't useful either. 

Please help 

Posted Sun 25th November, 2012 @ 15:47 by Gaby Coghlan

1 Answer

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Antigentic variability is when there are loads of different strains or types of each pathogen. Like influenza - you catch the flu loads of times in a lifetime, because there are so many different pathogens, each with different antigens - so different lymphocytes are needed to kill the pathogens. 

Answered Sun 25th November, 2012 @ 17:59 by Former Member