Emerging diseases are infectious diseases that have recently appeared or whose incidence and geographic range have increased drastically. We all know much about the emerging diseases (eg. SIDA, Ebola virus, SARS) that affect humans. Amphibians also have their own emerging diseases which pass unnoticed by the larger part of society. Amphibian emerging infectious diseases are produced by specific viruses and fungi that are extraordinarily infectious and difficult to eliminate. The symptoms of these diseases are complicated and although sometimes local haemorrhages and skin ulcerations are produced many times the infected animals die without evident external symptoms. Since the infected animals can suffer from secondary bacterial infections the complication is in diagnosing the illness. These diseases result in fatalities for the amphibians, making affected populations disappear rapidly. During the brief presence in the infected zone of tens or hundreds of dead animals no potentially causative environmental changes have been detected yet the amphibians have disappeared.