A general view of Texas Health Presbyterian Hospital Dallas is seen where patient Thomas Eric Duncan is being treated for the Ebola virus on October 4, 2014 in Dallas, Texas. Joe Raedle/Getty Images

Last Updated Oct 12, 2014 9:38 AM EDT

A health care worker at Texas Health Presbyterian Hospital who provided care for the Ebola patient who was hospitalized and later died there has tested positive for the disease in a preliminary test at the state public health laboratory in Austin. Confirmatory testing will be conducted by the Centers for Disease Control and Prevention in Atlanta, according to state officials.

The worker has been listed in stable condition.

Dr. David Varga, of the Texas Health Resource, said at a press conference Sunday morning the worker was in full protective gear when they provided care to the now-deceased Ebola patient Thomas Eric Duncan during his second visit to the hospital.

Varga did not identify the worker and said the family of the worker has "requested total privacy."

If the preliminary diagnosis is confirmed, it would be the first known case of the disease being contracted or transmitted in the U.S.

Varga said the health care worker reported a fever Friday night as part of a self-monitoring regimen required by the CDC.

The health care worker was then isolated within 90 minutes in the hospital's ICU and referred for testing. The preliminary test result was received late Saturday.

CDC Director Thomas Frieden told CBS' "Face The Nation" in an interview airing Sunday morning that the case is troubling "because clearly there was a breach in protocol."

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Texas health care worker tests positive for Ebola