Analyst's note:  The Texas Department of State Health Services says in a statement that a health care worker at Texas Health Presbyterian Hospital in Dallas, where patient Thomas Eric Duncan died of Ebola last week, tested positive for the virus, according to a preliminary test.

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A health care worker at a Dallas hospital tested positive for Ebola in a preliminary test, the Texas Department of State Health Services said in a statement early Sunday.

The health care worker at Texas Health Presbyterian Hospital, who was not identified in the statement, provided care for Thomas Eric Duncan, the first Ebola patient in the United States, who died last week.

The worker reported a "low grade fever" Friday night and was isolated and referred for testing. The preliminary result was received late Saturday.

"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 the statement. "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.

Texas Health Presbyterian Hospital has come under scruntiny for its handling of Duncan, who first showed up at the hospital's emergency room late on the evening of Sept. 25, complaining of a fever and severe pain. Although documents show that a nurse recorded early in Duncan's first hospital visit that he recently came to the U.S. from Africa and his temperature reached 103 degrees, he was prescribed antibiotics and told to take Tylenol, then returned to the apartment where he was staying with a Dallas woman and three other people.

The Associated Press reported that Duncan's temperature reading was flagged with an exclamation point in the hospital's record-keeping system.

Duncan died Oct. 8. A spokeswoman for the Texas Department of State Health Services said the agency was considering investigating the hospital for compliance with state health and safety laws.

The Associated Press contributed to this report.

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Dr. Aileen Marty tells Fusion what she saw fighting Ebola in Nigeria

"The Ebola outbreak continues to spiral out of control. Near the epicenter of the epidemic in West Africa, more than 3,400 people have died and more than 7,000 people have been infected with the virus. Officials are scrambling to contain the outbreak at its source and keep it from spreading.

The World Health Organization is sending doctors to countries where the virus is most prevalent — Liberia, Guinea, Sierra Leone and Nigeria. Fusion’s Jorge Ramos spoke to one of the doctors, Dr. Aileen Marty, who recently returned home to Miami after spending 31 days in Nigeria. She says she was surprised what happened when she arrived at Miami International Airport.

“I get to the kiosk…mark the fact that I’ve been in Nigeria and nobody cares, nobody stopped me,” Marty said.

“Not a single test?” Ramos asked her, surprised.

“Nothing,” Marty answered.

.... Dr. Marty says she was not surprised to hear about the first case of Ebola  in the United States.

“If we don’t change our entry method and this outbreak continues to get completely out of control…it’s likely to be seen in other countries,” Marty warned.

"