Anthrax Cross-Pollination

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NPR's Larry Abramson reports that public health investigators are puzzled at how anthrax spores are spreading through the postal system and beyond. They're unsure how many of the spores have been released and how fast they spread. They're also questioning their assumption that thousands of anthrax spores are required to cause inhalation anthrax. They now wonder whether trace amounts could cause illness.

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