Batrachochytrium dendrobatidis, or B.d., a fungus not harmful to humans but deadly for certain amphibian species, is finding its way into the U.S. via the backs of American bullfrogs grown overseas. One study reported 62% of imported frogs tested were infected, prompting concerns from biologists. "It's jumping from species to species to species, and we have very little predictability about what species it's going to have an effect on," said Vance T. Vredenburg, a biology professor and amphibian expert at San Francisco State University.

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