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The Centers for Disease Control and Prevention declares that four lab workers may have been recommended to take antibiotics as a precaution on Thursday, May 28, 2015. This is because an Army in Utah mistakenly shipped live anthrax samples to their labs in other states. However, the lab workers are reportedly not sick.

Meanwhile, about two-dozen people are being treated for a likely anthrax expose at Osan Air Base in South Korea.

This spread began in Utah when an Army unintentionally distributed live samples of anthrax to labs in nine other states, stimulating an enduring effort to recover them. The Pentagon says that the problem may have been a failure in the technical process of killing the anthrax samples.

“There are no suspected cases of anthrax infection,” said Pentagon spokesman Col. Steve Warren.

A defense official said that of the 22 people in South Korea who might have been exposed, 10 are with the U.S. Army, three are government contractors, four are civilians and five are with the U.S. Air Force.