 China Daily | New bird 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 H7N9 bird flu virus H7N9 flu transmission studied Experts Look Beyond Birds in Investigation of Flu Strain in China |
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