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Large Flu Vaccine Maker Closes, Tightening Supply

The closure of a major flu vaccine manufacturer will cause major shortages during the upcoming flu season, say health officials. Before its license was suspended, the Chiron Corp. intended to ship 48 million doses of flu vaccine to the United States. NPR's Richard Knox reports.

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Since he joined NPR in 2000, Knox has covered a broad range of issues and events in public health, medicine, and science. His reports can be heard on NPR's Morning Edition, All Things Considered, Weekend Edition, Talk of the Nation, and newscasts.