This publication is a collection of essays on the biology of intracellular parasitisms where both bacterial and protozoan parasites are discussed. The juxtaposition of authors representing fields of research emphasizes the many common problems facing intracellular parasites and the hosts that harbor them. In addition, numerous illustrations of how different parasites and host attempt to solve these problems in different ways are provided. The book includes one or more chapters on Bdellovibrio, Chlamydia, Rickettsia, Coxiella, Legionella, Shigellae, Mycobacterium, Microsporidium, Plasmodium, and Toxoplasma. The authors frequently speculate and generalize on the subject matter discussed.