Interactive Civilian wrote...
I imagine not. If limited and controlled exposure to possible pathogens were enough for the Quarians to get control of their immune responses, I'm sure they would have figured that out at some point in the last 300 years.
Tali is a special case for a couple of reasons.
1.She's survived early exposure to human germs ME1.
2.She's made out with a human and lived to tell the tale, even though she got sick it does not put her off at all (chat post game).
3.She's not living on the flotila.This is more the key point. If you wanted to "cure" all Quarians it requires a radical enviroment shift for 17 million people.
On a related note if she was "cured" then her anti bodies could be the key to re-establishing the Quarians as a settled race.