|aThe avian influenza A (H5N1) virus erupted in Asia in 2003, causing infections in poultry and wild birds in Asia and Europe. In Asia it has also infected humans who were in close proximity to the affected birds. According to the World Health Organisation, as of March 22 this year, there are 184 confirmed cases of people infected with the H5N1 avian flu virus, with 103 resulting in death. Do we have a worldwide outbreak on our hands and should we be preparing for an influenza pandemic? The biggest fear is that the H5N1 virus will mutate into a strain that is easily transmissible among humans. This program takes viewers across the globe to see how the war against bird flu is being fought on two fronts. In the field, scientists go to the most remote corners of the globe to hunt down the killer disease in the birds that spread it. And in the lab, scientists bring the deadliest bird flu in history back to life, in an attempt to stop a pandemic today.