Fears, tension in US as 'Breach in protocol' caused second Ebola infection

Obama and Jonathan discussing how to tackle Ebola

A health care worker who cared for the Ebola patient who died last week tested positive for the deadly virus, sending health officials scrambling Sunday to find the "breach in protocol" that resulted in her infection.

The woman was among caregivers for Thomas Eric Duncan, who died Wednesday at Texas Health Presbyterian Hospital. A state test finding that she had Ebola was confirmed Sunday by the Centers for Disease Control and Prevention, making it the first known case transmitted in the U.S.

CDC chief Thomas Frieden said his agency will investigate how a worker in full protective gear contracted the virus.

"At some point there was a breach in protocol," Frieden said. "That breach in protocol resulted in this infection."