Published in Medical Letter on the CDC and FDA, June 23rd, 2002
But health officials cautioned that the samples were taken beginning September 18 - a full week after the twin towers collapsed and after much of the huge cloud of smoke had settled.
"The piece of data we don't have is what was the exposure to these folks who got caught in the dust cloud," said Ken Wallingford, a researcher with the CDC's National Institute for Occupational Safety and Health. "That would've been a massive skin and inhalation exposure."
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