[jacquesm]

You beat the infection due to a skirmish between your 'standard' immune system and the virus infected cells. As soon as you get a full-on immune system response there is a change and some more long term effects come into play. Nature tends to be very efficient, engaging an expensive mechanism apparently leads to caching the knowledge so it can be recalled when required, but if the expense outweighs the cost of doing so then it stays on a one-off basis.

The longer you deal with biology the more impressive it all is.

[eli_gottlieb]

That was such a good description of learning/updating in the immune system that I just had to go follow you on Twitter!