Human immunodeficiency virus and AIDS have received much attention in the last decade. As the major cause of death in young adults, this concern is merited. AIDS has also ushered onto the clinical agenda a number of unusual and interesting pathogens. These have had considerably less attention than the virus itself, but are arguably as important. This book attempts to put into one volume a state of the art review of the basic biology of these opportunistic organisms. When compiling this book, the perceived difficulty was deciding how to restrict the number of chapters, as there is a large...