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WIDE ANGLE travels to Vietnam to investigate the threat of a global pandemic.

Producer Micha Fink talks about the making of H5N1 Killer Flu.

Since 2003, 58 people have died of avian flu in Southeast Asia, and unofficial reports coming out of China suggest that the number may be significantly higher.

Scientists have long forecast the appearance of an influenza virus capable of infecting 40 percent of the world's human population and killing unimaginable numbers. Recently, a new strain, H5N1 avian influenza, has shown all the earmarks of becoming that disease. Until now, it has largely been confined to certain bird species, but that may be changing.