Loretta A. Cormier is a Professor in the Department of Anthropology at the University of Alabama, USA.Pauline E. Jolly is a Professor in the Department of Epidemiology (School of Public Health) at the University of Alabama, USA.

• Preface 1. The Ecological Context 2. Viruses 3. Protozoa 4. Bacteria 5. Helminths 6. Concluding Remarks References

Loretta A. Cormier is a Professor in the Department of Anthropology at the University of Alabama, USA.Pauline E. Jolly is a Professor in the Department of Epidemiology (School of Public Health) at the University of Alabama, USA.

• Preface 1. The Ecological Context 2. Viruses 3. Protozoa 4. Bacteria 5. Helminths 6. Concluding Remarks References

Loretta A. Cormier is a Professor in the Department of Anthropology at the University of Alabama, USA.Pauline E. Jolly is a Professor in the Department of Epidemiology (School of Public Health) at the University of Alabama, USA.

• Preface 1. The Ecological Context 2. Viruses 3. Protozoa 4. Bacteria 5. Helminths 6. Concluding Remarks References