Bioterrorism is back in the news with word of a dangerous new strain of botulism, for which there is no antidote. The strain is so powerful, the researchers who discovered it won’t release its genetic code until an antidote is found because they fear it will fall into the wrong hands.

U.S. agencies like the Centers for Disease Control keep lists of potential bioterrorism agents that have the highest risks of mortality and morbidity, and botulism is one of them.

However, according to national bioterrorism experts, these government lists may be based more on the deadliness of pathogens than on the true risks they pose.