The Conficker Internet virus has infected important computerized medical devices, but governmental red tape interfered with their repair, an organizer of an antivirus working group told Congress on Friday.

Rodney Joffe, one of the founders of an unofficial organization known as the Conficker Working Group, said that government regulations prevented hospital staff from carrying out the repairs.

Joffe, who also is the senior vice president for the telecom clearinghouse Neustar, told a panel of ...