They hope to improve their understanding of what specifically causes anthrax outbreaks.
Mr. Thompson later held news conferences about the anthrax outbreak, assisted by government scientists.
The agency believed that it was prepared for a real anthrax outbreak.
And experts caution that the anthrax outbreak may not be over.
The Sverdlovsk incident provided unusually complete data about an anthrax outbreak.
The handling of the anthrax outbreak has left a nervous public skeptical about the effectiveness of government agencies.
European officials called the administration's rejection of the French proposal condemning the anthrax outbreak shortsighted and a missed opportunity.
After the first anthrax outbreak, they should have made sure security was tight.
Also of concern for the average American is the question of whether enough drugs are available in case of a large-scale anthrax outbreak.
In 1883, there was an anthrax outbreak in Breitenthal that claimed three lives.