I've never had crypto in my animals... but I know it is considered 100% fatal and an extremely slow death. The idea of putting down an animal that is OK now kind of sucks...but at the same time, you don't really want to make it suffer. I think the risk of spreading is too great to not put her down.
I've read this page (kind of far down, do a find for "crypto" in IE and it will take you right to it.
http://www.petno.homestead.com/Reptiles.html
Basically... it's a personal account of someone who's collection got wiped out by crypto infected animals from petco... the page obviously bashed petco, but did seem to have a first-hand viewpoint of it. They did NOT QUARENTINE their new animals... so yeah it sucks but it's kind of their fault. Take the following for what it's worth.
Here's a few quotes that stuck out to me:
"There is no cure, and for leopard geckos, it is 100% fatal."
"Once exposed, these animals would always be carriers, and would someday die of this disease"
"I found out that it was very resistant to disinfectants. The only way to kill it on surfaces was a 10% bleach solution"
"This means that these infected animals MUST BE DESTROYED in order to keep them from infecting other animals "
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Brian Skibinski
Brian@MilwaukeeReptiles.com
WYSIWYG 
