After Iraq was found not to have weapons of mass destruction after all, the concern about which of the following died down?

Name: After Iraq was found not to have weapons of mass destruction after all, the concern about which of the following died down?
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The concern about smallpox as a weapon of mass destruction died down after Iraq was found not to have weapons of mass destruction. Prior to this, there was significant worry that smallpox could be used in bioterrorism.

After Iraq Was Found Not to Have Weapons of Mass