Key scientific and political milestones from around the world, charting the first appearance of H5N1 avian flu in Hong Kong in 1997 to its global spread today, and links to archives.
Is there going to be a pandemic? History suggests that this question is a matter of when, rather than if. Flu pandemics occur every 30-70 years, as newly evolved flu viruses sweep across entire world regions infecting enormous numbers of people.
The recreation of one of the deadliest diseases known could help us to prevent another pandemic. Or it might trigger one, say critics. Andreas von Bubnoff investigates whether the benefits outweigh the risks.
The discovery of a new virulence mechanism in an influenza A (H1N1) virus may help to explain how flu viruses acquire virulence and why the 1918 flu pandemic was so devastating.