Slimboyfat- There is some evidence, but its really to soon to tell in the long run.
For instance, if I get pneumonia like I used to get over and over again, I could very well have lasting lung damage, like I do now. I have two nodules in my lungs from years of what seemed never ending pneumonia. They are the same as they were 10 years ago as they are now. But, If the doctor was to, or when they have ex-rayed my lungs right after a bout of pneumonia they have shown that those nodules or scar tissue being inflamed for months, giving a false reading.Then they go back to the way they were.
I've gone thru it enough to not let them ex-ray me for a few months so they do not scare the crap out of me having multiple test over the next months after, only for them to see that they got a bit to 'gung ho' with tests to soon. That's is my case.
I'm not saying it wont have lasting effects. I'm saying that to really get a clear picture of "lasting damage" will take some years to come to a conclusion on lasting damage to healthy individuals vs lasting damage to individuals who had underlying health problems to begin with.
Those are my thoughts. I just don't see how they can conclude this with certainty yet.