DALLAS, Oct. 16 (UPI) -- Two nurses caring for the first Ebola patient diagnosed in the United States, Thomas Eric Duncan, have since contracted the deadly disease. And though CDC Director Tom Frieden as insisted a "breach of protocol" was to blame, the agency head admitted to Congress that officials don't know exactly how the two caregivers contracted the virus.
"While we do not yet know exactly how these transmissions occurred, they demonstrate the need to strengthen the procedures for infection-control protocols which allowed for exposure to the virus," Frieden told lawmakers during his testimony at a Wednesday hearing on the U.S. response to Ebola, held by the House Subcommittee on Oversight and Investigations.