From Knight Ridder Newspapers:
China offered the West some viral material in 2004, but it refused to do so following an outbreak among migratory birds in Qinghai Lake in western China in May. Instead, it put the detailed genetic sequencing of the virus on a secure Web site to share.
Bekedam said Chinese scientists “were a bit annoyed that their contributions were not always acknowledged” in the international community, so they decided to keep the live viruses for themselves.