Seasonal Flu Outbreaks Start in Asia: Study

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Holmes's team analyzed the entire gene sequence of their flu samples. Using the entire genetic sequence, rather than just one gene such as the one for hemagglutinin, will make it possible to create even more effective vaccines, Holmes said.

"Focusing on that one gene alone, you're not getting the complete picture," Holmes said. "That may have a major bearing on why the vaccine fails sometimes."

To make a more effective vaccine, the first thing you need to do is look in the right place -- East and Southeast Asia, Holmes said. "You also have to look at the whole genome rather than just one gene alone."

More information

To learn more about the flu, visit the U.S. Centers for Disease Control and Prevention.