African Clawed Frog (<i>Xenopus Laevis</i>) (IMAGE) San Francisco State University Caption This is an African Clawed Frog (<i>Xenopus Laevis</i>). These frogs, originally imported for early 20th century pregnancy tests, carried a deadly amphibian disease to the US, according to a new study published in the journal <i>PLOS ONE</i>. San Francisco State University biologist Vance Vredenburg and colleagues have found the first evidence of the <i>Batrachochytrium dendrobatidis</i> fungus among introduced feral populations in the US. Credit Photo credit: Adam Bewick Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.