Abstract
The European Organization for Research and Treatment of Cancer (EORTC)/ Invasive Fungal Infections Cooperative Group and the National Institute of Allergy and Infectious Diseases Mycoses Study Group (MSG) consensus definitions for opportunistic invasive fungal infections have achieved their objective in fostering better communication between researchers but their limitations necessitated revision. In the last two years a group of experts drawn from both sides of the Atlantic have agreed a proposal for a new set of definitions that attempt to rectify omissions and problems arising from the original set whilst preserving their basic principles.