It is like The Butterfly Effect, but the use of frogs in pregnancy tests has now spread a fungal disease which is wiping out amphibians. Hooray for old wives tales!
The wholesale importation of one species to another continent alarmingly has this kind of effect more often than we think. Rabbits in Australia, frogs in Australia, pretty much any animal in Australia. This is a bad omen for us colonizing the galaxy and one which very few sci-fi authors every really deal with (environmental suits are so not sexy). But if we can’t even shift African frogs to the States, what chance to we have of being galactic conquerors.