It does improve their overall health. If they aren't continuously exposed for around 6 months they can lose their innate immunity to that parasite. This would make them more susceptible to succumb to future exposures to those parasites.
If your immunity acquired via vaccination to measles stopped working, would you consider that good or bad to your overall health?
One minute you are claiming that you didn't say that infecting fish with ich improves their overall health and demand we give you citations (which I did), then a few hours later on post #325 you again state that being infected with ich "improves their overall health".
Also on post #325 you compare fish's immune system to humans to prove your point, but scroll back to post #193 and you claim that you can't compare fish immunity to mammals because they are so very, very, different.
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