Parasitic diseases still affect millions of people every year, especially in the tropics, causing considerable morbidity or death. Such infections within livestock are probably an even bigger problem, leading to poorer productivity, condemna­ tion of infected meat and considerable economic loss. Para­ sitological research has, however, helped the situation in some cases and the development of novel drugs, vaccines and diagnostics has improved our chances of controlling these diseases. Research into parasitic infections is, therefore, often goal­ orientated. However, the study of parasites and host/parasite relationships still remains one of the most exciting and in­ teresting aspects of biology. Scientists, from undergraduate students to research professors,