As natural as breathing: the flu virus
Farming and feeding the hungry: plant viruses and human enteroviruses
Raising cattle and eating meat: rinderpest, measles and mad cow virus
Slaking our thirst: the cholera bacteria and its toxic viruses
Weathering storms and droughts: West Nile virus and others alike
Getting lucky with a faulty gene: escape from simple retroviruses
Taking chances with sex: the herpes and papova viruses
Risking death with sex: the AIDS virus
Warring against humans and other animals: smallpox, monkeypox and alike
Raiding the wild for delicacies: the sars virus.