First off I must tell you that your Veterinarian is an idiot and a rip-off artist to boot. Coccidia is one of the most contagious diseases any Reptile can contract. He should have told you immediately that any Geckos that were in contact with the one that died were infected, and needed to be treated for the disease. He should have prescribed the Albon at that time.
I know because in 1998 I purchased a group of Striped and Jungle phase Leopard Geckos from a very prominent Reptile breeder that had the disease when I received them. I was able to save 6 of the 10 Geckos with the help of Dr Roger J. Klingenberg D.V.M.
For those of you who are uninformed on who Dr Klingenberg is, he is the author of UNDERSTANDING REPTILE PARASITES. It is published by the highly acclaimed Advanced Vivarium Systems® series. Here is a link to it. -http://www.avsbooks.com/avs/repparasites.asp
The very cool thing about Dr Klingenberg is that he does phone consultations. They are not cheap but are under $100.00. That will include the consultation, a detailed description of how to treat the disease and the Medicine needed to treat the disease. In this case he will send you the Albon and all of the dosing instructions. He will also include the instructions on the fastidious cage cleaning needed to get rid of it.
I am including his contact information below.
Reptile Medicine & Surgery
Roger Klingenberg, D.V.M.
Phone and Fax Consultations Available For: Medical Problems Surgery
Husbandry & Breeding Parasitology Other Services: Fecal Exams by Mail Necropsies.
Sheep Draw Veterinary Hospital
6297 West 10th Street
Greeley, CO 80634
Phone 970-351-0936
Fax (970) 352-6220
I wish you good luck in treating the other ones.
Albey
Albey's "Too Cool" Reptiles