1
Dept. of Virology and WHO National Influenza Centre,
Erasmus University Rotterdam, P.O. Box 1738,
3000 DR Rotterdam
2
Dept. of Virology, CKVL, Leiden University Medical
Center, P.O Box 9600, 2300 RC
Leiden
The Netherlands
Claas@virology.azl.nl
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.