A Texas health care worker who was in full protective gear when they provided hospital care for an Ebola patient who later died has tested positive for the virus and is in stable condition, health officials said Sunday. If the preliminary diagnosis is confirmed, it would be the first known case of the disease being contracted or transmitted in the U.S.

Dr. Daniel Varga, of the Texas Health Resources, said during a news conference Sunday that the worker wore a gown, gloves, mask and shield when they provided care to Thomas Eric Duncan during his second visit to Texas Health Presbyterian Hospital. Varga did not identify the worker and says the family of the worker has ‘‘requested total privacy.’’

Varga says the health care worker reported a fever Friday night as part of a self-monitoring regimen required by the Atlanta-based Centers for Disease Control and Prevention. He said another person also remains in isolation, and the hospital has stopped accepting new emergency room patients.

Duncan, the first person diagnosed with Ebola in the U.S., died Wednesday in Dallas.

‘‘We knew a second case could be a reality, and we've been preparing for this possibility,’’ Dr. David Lakey, commissioner of the Texas Department of State Health Services, said in a statement Sunday. ‘‘We are broadening our team in Dallas and working with extreme diligence to prevent further spread.’’

Health officials have interviewed the patient and are identifying any contacts or potential exposures. They said people who had contact with the health care worker after symptoms emerged will be monitored based on the nature of their interactions and the potential they were exposed to the virus.

Officials said they also received information that there may be a pet in the health care worker’s apartment, and they have a plan in place to care for the animal. They do not believe the pet has signs of having contracted Ebola.

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