CDC scientists were studying the bacteria in a high-level biosecurity lab and then transferred the samples to three lower-security labs without first properly inactivating the live microbes. Workers in those labs handled the samples without using personal protective equipment, such as gloves. The procedural lapse happened between June 6 and June 13, and CDC spokesperson Thomas Skinner told The New York Times that while none of the researchers exposed to the bacteria are showing symptoms of infection, many of them are receiving prophylactic antibiotic treatment “out of an abundance of caution.”
CNN reported on Thursday afternoon that 54 CDC employees determined to have been in the labs or hallways at the time live anthrax was present have been seen by the agency’s Occupational Health Clinic. Of those, only two people chose not to take oral antibiotics. An additional 27 staffers have been given the anthrax vaccine. Other exposed individuals were scheduled to be seen by doctors on Friday.
Paul Meechan, director of the environmental health and safety compliance office at the CDC, told The Guardian that the agency discovered the exposure on the evening of June 13 and is conducting an internal investigation to determine how the lapse occurred. “This should not have happened,” he said. “We’re taking care of it. We will not let our people be at risk.”
“We will report findings of this review and all steps we take to improve lab-safety processes as a result of this incident,” the CDC’s statement read.