The popularity of germ-free animal models, particularly mice, for investigation of human physiology and disease has recently exploded. This book provides the first manual for the maintenance, husbandry, and experimental manipulation of germ-free and gnotobiotic mice. It includes information on all aspects of establishing and operating a germ-free mouse research facility, from basic principles and equipment to detailed instructions for assembling and maintaining isolators, sterilizing supplies, handling animals, monitoring sterility, and managing personnel and records.