Hi Frank,
Chytrid was reported as the cause of mortality (pers communication from the vet tech at another facility) in the dolflini (which is why I commented on this species specifically).
From a communication with the ex-reptile Curator at the Baltimore Zoo, when I asked him about the bolitoglossids in the chytrid hotzone in Central America, he indicated that these were also being extirpated along with the high-altitude anurans.
In general, I agree with you Frank that chytrid is endemic within wild caudate populations, along with bullfrogs, tiger salamanders look to be a carrier. (Xenopus are apparently immune and may have been the initial carrier species for global distribution).
There are a couple of recent papers that discuss differential susceptiability to chytrid but it does appear in general to be more lethal in captive collections that in many wild populations.
We have not seen chytrid in our collection to date. The pathologist screens all amphibian necropsies for chytrid however, if we did get chytrid in the collection we would treat all the amphibians as we are a holding institution for a couple of very chytrid sensitive species (Atelopus zeteki and Bufo baxteri)
Ed