This book provides the fundamental basis for a natural classification of the family Rickettsiaceae and perhaps even the order Rickettsiales. It shows how the pathogenic rickettsiae could have evolved in the course of geologic time through a series of evolutionary developments.
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