Nature: The US Department of Defense (DOD) announced on 27 May that it had accidentally shipped live anthrax spores to labs in nine US states and a US military base in South Korea. The facilities that received the samples did not have systems in place to protect lab employees against anthrax exposure because they were expecting to receive spores that had been killed with radiation. It is not clear how many people were actually exposed. The DOD says that 22 people in South Korea are getting preventive treatment, but it has not confirmed how many people in the United States are being treated.