The third edition of Principles of Virology has just been published by ASM Press. Written by S. J. Flint, L. W. Enquist, V. R. Racaniello, and A. M. Skalka, it is now two volumes to make it easier to handle and carry in backpacks, bags, and briefcases. Of course, the textbook is also completely revised and updated to reflect important advances in the field. The textbook continues to fill the gap between introductory texts and advanced reviews of major virus families. These two volumes provide upper-level undergraduates, graduate students, and medical students with a state-of-the-art introduction to all aspects of virology.