Hello,
Well, I wouldn't give up on negative colonies. I do come in contact with people who talk about trying to get a negative colony, so hopefully one of these days things will change.
There are a good number of negatives, per information from the lab though. If people are careful there wont be any contamination rates but you have to be vigilant & use care when bringing another dragon into the home.
I will never give up though & hope to have some breeders on board one day.
Tracie