Shanghai: Developing a vaccine for the H7N9 strain of bird flu that has killed 10 people in eastern China could take "many months", US public health experts have said. Chinese authorities had confirmed 38 human cases of H7N9 avian influenza as of yesterday evening after announcing nearly two weeks ago that they had found the strain in humans for the first time. Earlier vaccines targeting similar viruses had produced poor results, two members of the influenza division of the US Centers for Disease Control and Prevention (CDC) wrote in the New England Journal of Medicine. "Even if new vaccine manufacturing technologies... are utilised, the process from vaccine development to availability will probably take many months," said Timothy Uyeki and Nancy Cox.
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