Few things on Earth are more frightening than viruses. SARS and West Nile Virus, as well as the impending threat of a worldwide bird flu pandemic, have commandeered scientific resources around the globe. Virus Hunters follows the front line workers in this war on viruses, their triumphs and defeats, the challenges they face in developing vaccines, and the limitations of this approach. Virus Hunters also explores the new and largely unknown epidemic of chronic diseases, more and more of which are now suspected of being caused by viruses.