Research scientists who sparked global alarm in 2011 with a laboratory-grown strain of bird flu, are seeking to try such experiments again with a new strain that has killed at least 43 people in China this year. The proposal for research came Wednesday in an open letter from 22 prominent influenza researchers, stressing the need for new studies on the H7N9 virus that first appeared in March in eastern China. The letter, published in the research journal Nature, and separately in Science, ...
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