This book provides the fundamental basis for a natural classification of the family Rickettsiaceae and perhaps even the order Rickettsiales. It explores many fields and disciplines for evidence pertinent to an evolutionary history of the rickettsiae.
1. Introduction 2. The Distribution and Relationships of Rickettsiae 3. Evolution of the Tick-Rickettsia Relationship 4. Evolution and Distribution of Rodents 5. The Tickborne Rickettsiae of the Spotted Fever or Tick-Typhus Group 6. The Typhus Complex: Rickettsia typhi and R. prowwazekii. Adaptation to Insects