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(CNN) - Anthrax. Smallpox. A potentially deadly strain of the flu virus. The American public trusts the Centers for Disease Control and Prevention to handle dangerous biological materials, but recent incidents have put a damper on the agency's reputation, members of Congress said Wednesday.
"What happened was completely unacceptable," CDC Director Dr. Tom Frieden said in his testimony before the Energy and Commerce Committee's subcommittee for Oversight and Investigations.
"It never should have happened."