Washington: Genetic sequencing has been used by researchers to trace the source and evolution of the avian H7N9 influenza virus that emerged in humans in China earlier this year.Working in three Chinese provinces, researchers led by Yi Guan , Ph.D., of the University of Hong Kong collected samples from the throats and digestive tracts of chickens, ducks, geese, pigeons and quail. Fecal and water samples from live poultry markets and the natural environment were also collected.From these samples, the researchers isolated several influenza viruses and genetically sequenced those of the H7N9 subtype as well as related H7N7 and H9N2 viruses.
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