A second Dallas hospital worker who provided care for the first Ebola patient diagnosed in the U.S. has tested positive for the disease, pointing to lapses beyond how one individual may have donned and removed personal protective garb.

It’s not clear how the second worker contracted the virus. Authorities declined to say what position she holds at the hospital or the type of care she provided to Thomas Eric Duncan, who was diagnosed with Ebola after coming to the U.S. from Liberia. Duncan died Oct. 8.

Officials have said they also don’t know how the first health worker, a nurse, became infected. But the federal Centers for Disease Control and Prevention said “an additional health care worker testing positive for Ebola is a serious concern.”

“What happened there (in Dallas), regardless of the reason, is not acceptable. It shouldn’t have happened,” Anthony Fauci, director of the Institute of Allergy and Infectious Diseases of NIH, said on MSNBC Wednesday.

The worker at Texas Health Presbyterian Hospital was monitoring herself for symptoms, Dallas County Judge Clay Jenkins said. The unidentified woman reported a fever Tuesday. She was in isolation within 90 minutes, Jenkins said.

“We are looking at every element of our personal protection equipment and infection control in the hospital,” said Dr. Daniel Varga, chief clinical officer for Texas Health Resources, which operates Texas Health Presbyterian Hospital Dallas.

Dr. Tom Frieden, head of the CDC, has acknowledged that the government wasn’t aggressive enough in managing Ebola and containing the virus as it spread from an infected patient to a nurse at a Dallas hospital.

“We could’ve sent a more robust hospital infection control team and been more hands-on with the hospital from day one about exactly how this should be managed,” he said Tuesday.

The second case may help health officials determine where the infection control breach is occurring and make practices safer for health workers everywhere. For example, if both health workers were involved in drawing Duncan’s blood, placing an intravenous line or suctioning mucus when Duncan was on a breathing machine, that would be recognized as a particularly high-risk activity. It also might reveal which body fluids pose the greatest risk.

The CDC was conducting confirmatory testing of a preliminary Ebola test conducted late Tuesday at a state public health laboratory in Austin, Texas, which came back positive.

Emergency responders in hazardous materials suits began work before dawn Wednesday to decontaminate the Dallas apartment of the second hospital worker. Officials said she lives alone with no pets.

Notices handed out to neighbors advise them that “a health care worker who lives in your area has tested positive for Ebola.”

Ryan Fus, 24, who lives in the same building as the blocked-off apartment, said police knocked on his door before 6 a.m. to notify him and make sure he was doing OK.

“It’s a little scary. It’s a little shocking that it’s right near me,” he said. “But I’m not afraid or anything like that. I’m not gonna run away.”

Frieden outlined new steps this week designed to stop the spread of the disease, including the creation of an Ebola response team, increased training for health care workers nationwide and changes at the Texas hospital to minimize the risk of more infections.

“I wish we had put a team like this on the ground the day the patient — the first patient — was diagnosed. That might have prevented this infection,” Frieden said.

The stark admission came as the World Health Organization projected the pace of infections accelerating in West Africa to as many as 10,000 new cases a week within two months.

The new case lends support to nurses’ claims this week that they have inadequate training and in some cases, protective gear, to take care of Ebola patients.

“They’re not prepared” for what they are being asked to do, said RoseAnn DeMoro, executive director of National Nurses United, a union with 185,000 members.

Based on statements from nurses it did not identify, the union described how Duncan was left in an open area of the emergency room for hours. It said staff treated Duncan for days without the correct protective gear, that hazardous waste was allowed to pile up to the ceiling and safety protocols constantly changed.

DeMoro refused to say how many nurses made the statement about Texas Health Presbyterian Hospital, but insisted they were in a position to know what happened.

Officials say at least 76 people at the hospital might have been exposed, and all are being monitored for fever and other symptoms.

Nurse Nina Pham, 26, contracted the virus while caring for Duncan. Health officials are monitoring 48 others who had some contact with Duncan before he was admitted the hospital where he died.

Pham became the first person to contract the disease on U.S. soil. She released a statement Tuesday through Texas Health Presbyterian Hospital saying she was “doing well,” and the hospital listed her in good condition. She has received a plasma transfusion from a doctor who recovered from the virus.

Pham was in Duncan’s room often, from the day he was placed in intensive care until the day before he died.

She and other health care workers wore protective gear, including gowns, gloves, masks and face shields — and sometimes full-body suits — when caring for Duncan. Health officials have said there was a breach in protocol that led to the infections, but they don’t know where the breakdown occurred.

Among the changes Frieden announced was a plan to limit the number of health care workers who care for Ebola patients so they “can become more familiar and more systematic in how they put on and take off protective equipment, and they can become more comfortable in a healthy way with providing care in the isolation unit.”

FILE - A man walks up the stairway leading to the Texas Health Presbyterian Hospital in Dallas, in this Tuesday, Sept. 30, 2014 file photo. The Texas health department statement Wednesday Oct. 15, 2014 said a second health care worker tests positive for Ebola. (AP Photo/LM Otero, File)

FILE – A man walks up the stairway leading to the Texas Health Presbyterian Hospital in Dallas, in this Tuesday, Sept. 30, 2014 file photo. The Texas health department statement Wednesday Oct. 15, 2014 said a second health care worker tests positive for Ebola. (AP Photo/LM Otero, File)

Associated Press Chief Medical Writer Marilynn Marchione and AP reporters Martha Mendoza, Maud Beelman, Matt Sedensky and Alex Sanz in Dallas contributed to this report.

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