To help animals that might get infected, researchers are trying to reproduce the fungus-fighting bacteria that naturally grow on some captive Panamanian golden frogs. They may then be able to transfer the bacteria to vulnerable amphibians. Researchers from the University of South Florida have also found that Cuban tree frogs can build more and more of a resis tance to chytrid if they are repeatedly infected and treated. It's too early to know if these treatments will work on a large scale and allow relocated frogs to return to their homes. But they offer hope.