A microscopic fungus known as chytrid fungus is posing a significant threat to amphibian populations worldwide. The pathogen infects the skin of frogs, toads, and salamanders, disrupting their ability to absorb water, salts, and oxygen. Infected amphibians exhibit symptoms including lethargy, weight loss, and skin ulcers, often resulting in death. The fungus then spreads by releasing spores from deceased hosts to infect others.

First identified in the late 1980s, the chytrid fungus has been linked to the extinction of approximately 90 amphibian species over the past four decades, with many others facing the risk of disappearing. Genetic analyses trace some strains of the fungus back to the Korean peninsula, highlighting a likely origin point for its spread.

An international study published in 2018 by researchers using data in the journal Science connected the fungus’s global dissemination to the rise in commercial amphibian trade. As demand for exotic frogs and salamanders surged in the pet market, localized outbreaks transitioned into a worldwide epidemic affecting wild populations.

In response to this growing crisis, scientists at the University of Melbourne and the University of Rochester developed a novel fluorescent infection model in 2024 to detect chytrid fungus more efficiently. This advancement provides a valuable tool for monitoring infection levels in both laboratory and potentially field settings.

Treatment approaches such as antifungal baths have demonstrated success in saving individual amphibians under controlled conditions. However, experts caution that such measures are not feasible on a broad ecological scale and do not address the underlying challenge of halting the fungus’s spread through global trade and habitat management.

The chytrid fungus continues to present one of the most severe threats to amphibian biodiversity, underscoring the need for coordinated international efforts to monitor, control, and mitigate its impact on vulnerable species.