# Scientists Uncover Why Some Frogs Survive Deadly Fungus Early immune development key to amphibian survival. - **Source:** [Latest Science News -- ScienceDaily](https://brifing.si/source/0eef8637-6c5b-4e79-8f5b-6c9c6b36cf16) - **Published:** 2026-07-15 - **Original article:** - **On Brifing:** https://brifing.si/s/1a947456-16bc-4d86-ac45-ee6c39b144c1 ## Impact of the Deadly Fungus The chytrid fungus, Batrachochytrium dendrobatidis (Bd), has caused catastrophic declines in frog and toad populations worldwide. This fungus damages amphibians' skin, disrupting their ability to regulate water, salts, and minerals. While young amphibians are protected due to their lack of keratin-rich skin, adults become vulnerable to infection. ## Scope of the Research Scientists studied common midwife toads living around four lakes in the Pyrenees of France and Spain, all of which experienced severe Bd outbreaks. While one lake's population continued to decline, the other three showed recovery. Researchers aimed to understand the reasons behind these differences. ## Early Immune Development Researchers found that toads from recovering populations developed antimicrobial peptides much earlier, during the tadpole stage. These peptides provided protection against infections in adulthood. In contrast, struggling populations produced fewer peptides during the tadpole stage, leaving them less prepared for Bd infections. ## Peptide Diversity The study examined peptides released from the toads' skin and identified 1,152 different peptides, only seven of which had been previously documented. Tadpoles with higher peptide diversity were more likely to survive ongoing Bd outbreaks, while those with fewer peptides continued to suffer high mortality rates. ## Medical Potential The peptides discovered in this study have potential applications in human health, particularly in addressing antimicrobial resistance. Many medicines, such as penicillin, originated from natural sources, and these peptides could lead to new treatments for infections. ## Significance of the Research This study highlights how amphibians can recover from deadly fungal outbreaks and opens doors for new medical treatments. Early immune development and peptide diversity are key findings that could have implications for both natural ecosystems and human health. ## Sources covering this story - https://www.sciencedaily.com/releases/2026/07/260714225523.htm — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._