The accumulation of new knowledge over the last several years has provided the impetus for this, the 7th edition of Parasitic Diseases. By integrating all the salient information contained in over 1000 new references with the current descriptions of each pathogen, we continue the never-ending process of evaluating, revising, and improving our understanding of these parasitic organisms. New features to the 7th edition include a clinical summary section, additional life cycle diagrams and a pronouncer's guide to parasite names. Consideration of the biographies of those notable contributors to the field of parasitology has also been extended. Parasites Without Borders continues to make available, free of charge, the PDF version of Parasitic Diseases in both English and Spanish editions.