No single drug alone would be adequate to treat all people who would become infected during a worldwide flu pandemic, and nations need to stockpile more than one type of drug, say scientists at the National Institute for Medical Research in Great Britain.
They analyzed samples of H5N1 bird flu that had infected humans and found a mutation that made it resistant to the anti-viral drug Tamiflu. However, the mutation didn't protect the virus from another drug called Relenza, BBC News reported.
The study appears in the journal Nature.
