SARS. West Nile. HIV. Bird flu. Once-obscure and unknown diseases have caused some of the most worrisome outbreaks in recent years, and health officials can only guess what disease will strike next. Despite having the best medical and science know-how in history, today’s health experts are struggling to predict the next outbreak as even the rarest diseases can be easily and quickly spread around the globe because of air travel and international commerce. Some of last year’s outbreaks — including SARS worldwide and monkeypox’s first presence in the United States — emerged with little warning. Full Story