Recent studies suggest that many worldwide amphibian declines and die-offs could be attributed to an emerging infec-tious disease caused by the pathogenic chytrid fungus Batra-chochytrium dendrobatidis (Bd). Bd is widespread on all continents except Ant-arctica, where amphibian hosts do not occur. Bd infects over 350 amphibian species and has been implicated in driving the decline of over 200 of these by causing the disrup-tion of cutaneous functions. Therefore, Bd is classified as an emerging infectious agent in amphibians (Daszak et al. 1999)and considered to be a pan-demic pathogen belonging to a historically important group of virulent multihost pathogens that have had profound effects on entire communities and ecosystems (Fisher et al. 2009). The World Organization for Animal Health (OIE) re-cently listed Bd as a notifiable pathogen (OIE 2008), the first to be included for its threat to biodiversity. To assess the risks that Bd poses to European amphibians, scientists have gathered around the RACE (Risk Assessment of Chytridiomycosis to European Amphibian Biodiversity) project, which aims to develop tools and protocols to enable surveillance of Bd across Europe (http://www.bd-maps.eu/). Bd surveys are limited in northern Europe. To date, only samples from Denmark have been screened, and additional infor-mation is lacking from Fennoscandia, the area encompassing Norway, Sweden, Finland, Karelia, and the Kola Peninsula. Among amphibians present in this part of Europe, the one ex-tending its distribution furthest to the north is the Common Frog (Rana temporaria), a medium-sized anuran with a wide Palearc-tic distribution. The aim of our study was to investigate the presence and the intensity of Bd on a population of Common Frogs in subarctic Fennoscandia where the species occurs at the margin of its distribution range.