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(NEWSER) – The Texas health care worker who has become what is believed to be the first case of Ebola contracted on American soil wore full protective garb when treating Thomas Duncan, officials tell the AP.

She is a female nurse, adds CNN, citing inside sources, though her identity is being withheld as her family has "requested total privacy." While it's not entirely clear how she contracted the virus, CDC chief Dr. Tom Frieden today blamed a breakdown in protocol: "I think the fact that we don't know of a breach in protocol is concerning, because clearly there was a breach in protocol." Frieden said. "We have the ability to prevent the spread of Ebola by caring safely for patients ... We'll conduct a full investigation ... because infections only occur when there's a breach in protocol." Frieden says officials will particularly scrutinize how protective garb is taken off.

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