[Cazador]

In general, things higher up on the food web are more likely to be parasitized than things lower on the food web, but frogs and salamanders are at special risk because they're "consumers," and they live in prime habitat for parasites. For example, a single worm might be parasitized, but a frog that lives in water could become parasitized directly from the water OR become parasitized by eating a parasitized worm, bug, smaller amphib, etc. Younger frogs are less likely to carry as heavy of a burden as an older frog. Even knowing this, I sometimes feed live fish. I think it's a personal decision, but you should be informed about your decision.