DALLAS --

Public-health authorities also intensified their monitoring of Dallas hospital workers who cared for a Liberian man who died of Ebola. Their stepped-up efforts came a day after a 26-year-old nurse tested positive for the virus.

The nurse, identified as Nina Pham, was wearing protective gear when she took care of Thomas Eric Duncan, but became the first person to contract the disease within the United States. Nina Pham's family told WFAA-TV in Dallas that she was the health care worker with Ebola. A rector at her family's church told The Associated Press that Pham's mother told him Pham has the virus.

Pham, a graduate of Texas Christian University's nursing school, was monitoring her own temperature and went to the hospital Friday night as soon as she found out she was running a low fever. She is in isolation and in stable condition, health officials said.

Signs and symptoms of Ebola virus

Symptoms may appear anywhere from 2 to 21 days after exposure to Ebola, but the average is 8 to 10 days

When asked how many health care workers are being checked, Frieden said officials "don't have a number."

Health officials have relied on a 'self-monitoring' system when it comes to U.S. health care workers who care for isolated Ebola patients and wear recommended protective equipment. They expect workers to report any potential exposures to the virus and watch themselves for symptoms.

Besides the workers, health officials continue to track 48 people who were in contact before Duncan was admitted to the hospital and placed in isolation. They are monitoring one person the nurse was in contact with while she was in an infectious state.

None has exhibited symptoms, Frieden said.

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Health care workers monitored after Texas Ebola case