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'Darwinian medicine' is the science of trying to find evolutionary explanations for vulnerabilities to disease. A pathogen can survive in a population, explains Ewald, only if it can easily transmit its progeny from one host to another. One way to do this is to take a long time to disable a host, giving him plenty of time to come into contact with other potential victims. This would cause selection for a beneficial form of the disease. If the disease can pass quickly from one host to another, it will select for virulence in order to infect more hosts. Therefore if host-to-host passage can be delayed (by screened windows in the case of malaria), the disease will select for longevity---it makes no evolutionary sense to kill a host before the disease can be passed on.
Some diseases such as Ebola Fever kill the host too quickly, which is why Ewald believes this particular infection will not become pandemic. On the other hand the HTLV (human T Cell leukemia/lymphoma) viruses might very well increase in virulence and cause another pandemic like AIDS, since they are hosted and transmitted very much like AIDS. Ewald turns many of my preconceptions about disease upside down in this book, which is one reason why it is so fascinating.
If you have any interest at all in epidemiology or any concern about our 'once and future' plagues, read this book!
This author has also written "Plague Time: How Stealth Infections Cause Cancers, Heart Disease, and Other Deadly Ailments."
Evolution of Infectious Disease has already been called a milestone in the history of epidemiology. It is easy to understand why. The ideas presented in the book are revolutionary; the level of research to support them is impeccable; and they are conveyed in a manner which is both accessible and applicable. Given these qualities, it is no surprise that Evolution of Infectious Disease is now recognized as an essential text for understanding and combating disease.
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