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I was going to disagree with this since fish can loose their adaptive immunity in 6 months after last contact with a parasite, but it looks like others beat me to it. I'm slacking today.
You're taking what I (meant) a bit out of context (the comment was addressed to those who feel the more life in the tank the better) - on the surface - there is no advantage to having these parasites in a tank. I was replying to the comment that the more life the better. Just like with smallpox, malaria, etc there is no advantage to humans to have these parasites. However - if you go this route (ie. the route of extreme QT) - if they are re-exposed - they are certainly at higher risk of a more severe infection.
There are some comments out there that even without re-exposure - there still is some immune 'memory' though it does decrease somewhat between 3 and 6 months. Another common misconception - at 6 months -1 day - there is not immunity and at 6 months +1 day - the immunity is gone. No one knows how long the immunity lasts - only that it starts to wane.