Hookworms have failed to attract as consistent a scientific interest as other parasites of wide distribution. Until recently, nematodes have not offered the same potential for genetic or immunological analysis as unicellular organisms. Their life-cycle makes the epidemiology of hookworms particularly amenable to mathematical modeling, while accurate measurement in the field is tedious and unaesthetic, resulting in theory leading observation in the fundamental debate about exposure and immunity. This book presents a balanced account which will help recruit a new generation of researchers who will deepen research and provide more answers to the problems surrounding this parasite.