Four Defense Department workers in the United States and up to 22 overseas have been put in post-exposure treatment, a defense official said, following the revelation the U.S. military inadvertently shipped live anthrax samples in the past several days.
CNN learned on Wednesday a Maryland-based lab received the live samples, which prompted an across the board urgent review to see whether any other live anthrax has been shipped.
Officials are concerned because samples left over at the lab in Dugway, Utah, where the samples originated, were tested and determined to contain live agent.
The shipments, thought to be dead, were shipped under less rigorous conditions than the live agent protocol.
Science experts told the Defense Department there was no risk to the public from shipping in those containers. However, four workers across the nine states that received the shipments have been put on post-exposure treatment, because they handled samples.