The Centers for Disease Control and Prevention (CDC) announced late Friday that it has launched a wide-ranging investigation into the accidental shipment of live anthrax to 18 labs in the U.S. and abroad.
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While the CDC wrote in a statement that officials “do not suspect any risk to the general public,” at least 26 people are currently being treated for potential exposure, most of whom are at an air base in South Korea.

The CDC began its probe at the request of a private lab that had been contracted by the Department of Defense to prevent biological threats. That lab had not expected to receive live spores, according to the CDC.