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The casualties include an Agriculture Department scientist who spent a month in a coma after being infected by the E. coli bacteria her colleagues were experimenting with.
Another scientist, working in a New Zealand lab while on leave from an American biotechnology company, lost both legs and an arm after being infected by meningococcal bacteria, the subject of her vaccine research.
Last September, a University of Chicago scientist died after apparently being infected by the focus of his research: the bacterium that causes plague.
Whether handling deadly pathogens for biowarfare research, harnessing viruses to do humankind's bidding or genetically transforming cells to give them powers not found in nature, the estimated 232,000 employees in the nation's most sophisticated biotechnology labs work amid imponderable hazards. And some critics say the modern biolab often has fewer federal safety regulations than a typical blue-collar factory.
Even the head of the federal Occupational...