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A worker cleans empty cages used for transporting chickens, to prevent an outbreak of H7N9 infections at a wholesale poultry market in Hong Kong. Scientists who sparked an outcry by creating easier-to-spread versions of the bird flu want to try such experiments again using a worrisome new strain.

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Scientists plan controversial lab-made bird flu

WASHINGTON (AP) — Scientists who sparked an outcry by creating easier-to-spread versions of the bird flu for research purposes want to try such experiments again using a worrisome new strain. This time around, the U.S. government is promising extra scrutiny of such high-stakes research up front.

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