The importance of sex hormones in the control of infection is a neglected area in the pathogenesis of infectious disease. This book highlights the differences between males and females in their susceptibility to infection with viruses, bacteria and parasites. The key to this process is the way male and female sex steroids interact with cells of the immune response to either augment or inhibit protective host responses. The evolutionary significance of female dominance in controlling infection is contrasted with the hormonal upheaval during pregnancy and susceptibility to infection. This is a well-structured and eminently readable book. Those interested in the pathogenesis of infectious disease will find this a welcome addition. Recommended for institutional purchase as students will find this a useful reference source.