"Experts in Hong Kong warn that the human strain of the H5N1 bird flu that surfaced in Vietnam is showing resistance to the antiviral drug Tamiflu. Countries around the world are stockpiling Tamiflu to ward off a looming flu pandemic that could kill millions of people.

"There are now resistant H5N1 strains appearing, and we can't totally rely on one drug (Tamiflu)," said William Chui, honorary associate professor with the department of pharmacology at the Queen Mary Hospital in Hong Kong."

This info is over a year old, FYI.