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In the absence of standardized diagnosis and the presence of unique clinical syndromes, it is not surprising that considerable differences exist in the number of reported incidences of disease and the outcomes of various infections in cardiothoracic transplant (CTTX) recipients. Publications to date have employed variable and heterogeneous definitions of CTTX-related infections, thereby limiting the comparison between the types and incidence of infections and the generalizability of these data across transplant centers. Currently, there are no standard international definitions for infections uniquely related to CTTX, with the exception of Chagas disease and toxoplasmosis. 1 The purpose of the present working formulation is to provide consensus-derived expert opinion of definitions for infections in CTTX for epidemiologic, research and registry data use.