there's a lady on the meatrabbits board who has been able to prove that snuffles is curable.
it's not cheap.
involved medications.
What we can do is bring it under control again.
BUT it's a risky venture as once one rabbit starts to snot, then it's more contagious in the virulent form.
AND uncontrolled snuffles apparently starts to eat away at the bone tissues in the nose, causes breathing issues and what not.
IF one follows excellent isolation protocols it might be possible to contain it.
OVERALL, the generally accepted wisdom is...cull them out.
For those who don't want to cull them out then... if you can get rid of the stressor (via medication or whatever) then do so, but know that that particular rabbit is susceptible to virulent outbreaks and keep them away from vulnerable rabbits.
Consider what you are breeding for and if health is a priority, then breed for health and hold to a high standard. If it's generally overall healthy rabbits that you can put on your table, the odd sneezer isn't going to compromise that IF you can bring the virulency under control. (just as for instance rabbits with poor hocks isn't going to affect your food). IF you are breeding for show animals, be kind, and DON"T sell that sniffly rabbit to someone else.. even IF it is apparently under control. Just don't do it. BE kind, be courteous, and be aware.
AT Least this is what I've gleaned from the knowledge of others. Don't take any of it as gospel truth.