![]() Getty Images | New flu spread quietly, study suggests NBCNews.com (blog) By Maggie Fox, Senior Writer, NBC News. A new genetic analysis shows the H7N9 bird flu in China may have been spreading quietly for weeks or months in domestic animals. But it mutates once it infects a person, giving birth to new viruses that feel more at ... Elderly 'most at risk from bird flu virus' H7N9 flu transmission studied China confirms 91 H7N9 cases, 17 deaths |


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