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America got an unwanted crash course in microbiology in the months following the events of September 11, 2001, as a series of anthrax-laced letters sent through the U.S. mail spread illness and terror across the nation. As the FBI and other law enforcement agencies launched a massive and ultimately inconclusive investigation into the attacks that the FBI says killed five and sickened 17, worried Americans scrambled to lay in a supply of antibiotics - just in case. But almost as soon as the deadly outbreak began, it was over.
Just how did the attacks unfold? And just what do we know about anthrax and its deadly effects on the human body? Keep clicking to find out...
Credit: FBI