While possible, I doubt that most animals from Petco or Petsmart are cb. Additionally, I can definitely see a good chance for cross-contamination due to their poor attention to cleaning tanks between use and their penchant for mixing animals (i.e. green anoles--usually wc--with tree frogs).
Dr. Frye used to advertise that 80% of the frogs he tested had 3 or more parasites. That doesn't really get at my question, though. I'm trying to determine what the percentage of average cb frogs in the hobby have parasites--not the percentage of all frogs taken to a vet. Most people are going to get fecals when their frogs start behaving poorly. I would also venture to guess that nearly all (if not truly all) wc animals have parasites. So that muddies the statistics a bit (a lot, actually).
I was just wondering whether anyone was doing proactive fecals on their collections and what their experiences were with percentages of infected frogs. While it is intuitive that bacteria could be easily transmitted from parent to offspring, the infective mechanism for other parasites to be transmitted to offspring when the eggs are collected from a petri dish is not so obvious (unless feces are left on the petri dish). That leads me to believe that the rate of parasitically infected animals that are cb should be significantly lower than wc, and that comports with common reasoning in the pet hobby as a whole. I was just interested in seeing whether common reasoning bore out in reality.