As I said it depends on the parasite in question.
For example, in herps, you are not sure that you have killed anything in the cryptosporidia serpens complex (there appear to be several species here) unless you use straight household ammonia, live steam (which is above 212F), or autoclave. While cryptosporidia has not been well docmented in amphibians there are a couple of cases.
Here is some notation from a teaching lecture that gives some guidelines for bacterial and viral disinfection as anything that works on bacterial spores will kill most parasites. (some of the items to potenially worry about would be items like mycobacterial infections such as M. marinum )
see http://188.8.131.52/search?q=cache:7ED ... =clnk&cd=1