By Maggie Fox, Health and Science Editor
WASHINGTON (Reuters) - China's southern Guangdong Province is the source of the dangerous H5N1 avian flu virus, according to a genetic analysis of the virus published on Monday.
And Guangdong appears to be the source of renewed waves of the H5N1 strain, which has killed or forced the destruction of hundreds of millions of birds, the team at the University of California Irvine reported.
"We show that the Chinese province of Guangdong is the source of multiple H5N1 strains spreading at both regional and international scales," the researchers wrote in their report, published in the Proceedings of the National Academy of Sciences.
"It is probably still originating there and spreading," Walter Fitch, a professor of ecology and evolutionary biology who worked on the study, said in a telephone interview.
"If you can control the virus at its source, you can control it more efficiently," Fitch added in a statement.
"With a road map of where the strain has migrated, you're more likely to isolate the strain that you should be using to make the vaccine."
Since 2003, H5N1 has spread to more than 50 countries as far away from China as Nigeria and Britain. The real fear is that the virus could mutate into a form that people can easily pass from one to another and spark a pandemic. Continued...
http://www.reuters.com/article/worldNews/idUSN0531214820070305