SARS may currently dominate the headlines, but the Whyfiles takes another look at another fast-spreading viral disease: West Nile. West Nile has spread to 44 US states and beyond, and while it can be fatal to humans, it remains primarily a bird disease. The Whyfiles offers an in-depth exploration of West Nile in North American birds, tackling the questions "How far? How fast? What's next? Who's next?" The report also explains how researchers conduct bird studies, such as lab and field studies, anecdotal observations, and so on. Visitors may also view a QuickTime interview with Paul Slota of National Wildlife Health Center.