In this book Desowitz goes over the evidence for the origin and history of several diseases, including malaria, worm infestations, yellow fever, and syphylis, of which there are actually four different kinds. I didn't know anything about hookworm, and had never heard of John Rockefeller's campaign against hookworm in the southern United States. Rockefeffer's foundation also had a campaign against yellow fever, which apparently succeeded by inplementing simple mosquito control measures. But malaria, which I didn't know ever even existed in the US, lasted much longer here, up until World War II. As usual,Desowitz covers a lot of ground, and I found myself having to go back and look up things I had remembered wrong or not at all.