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ATLANTA — Revised guidance for health care workers treating Ebola patients will include using protective gear ‘‘with no skin showing,’’ a top federal health official said Sunday, and the Pentagon announced it was forming a team to assist medical staff in the United States, if needed.

Dr. Anthony Fauci, head of the National Institute of Allergy and Infectious Diseases, said those caring for an Ebola patient in Dallas were vulnerable because some of their skin was exposed.

The Centers for Disease Control and Prevention is working on revisions to safety protocols. Earlier ones, he said, were based on a World Health Organization model in which care was given in more remote places, often outdoors, and without intensive training for health workers.

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‘‘So there were parts about that protocol that left vulnerability, parts of the skin that were open,’’ said Fauci, who appeared on five network news programs.

RELATED: More coverage on the Ebola outbreak

The CDC guidance was expected as early as Saturday, but its release has been pushed back while it continues to go through review by experts and government officials.

Health officials had previously allowed hospitals some flexibility to use available covering when dealing with suspected Ebola patients.

The new guidelines are expected to set a firmer standard: calling for full-body suits and hoods that protect worker’s necks, setting rigorous rules for removal of equipment and disinfection of hands, and calling for a ‘‘site manager’’ to supervise the putting on and taking off of equipment.

The guidelines are expected to require a ‘‘buddy system,’’ in which workers check each other as they come in and go out, according to an official who was familiar with the guidelines but not authorized to discuss them before their release.

Hospital workers also will be expected to practice getting in and out of the equipment, the official said.

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The American Nurses Association and other groups have called for better guidance that sets clearer standards on what kind of equipment, how to put it on, and how to take it off.

‘‘We’re disappointed that the recommendations are still not available,’’ association president Pamela Cipriano said. ‘‘Having a lag in official direction from the CDC doesn’t instill the greatest confidence in their ability to rapidly respond.’’

Cipriano said she understands the guidance will also include a call for anterooms, apart from the patient room, where protective equipment must be put on and taken off.

The push stems from the infection of two nurses at a Dallas hospital who treated an Ebola-infected patient named Thomas Eric Duncan, the first person diagnosed with the virus in the United States.

The nurses, Nina Pham and Amber Joy Vinson, were diagnosed with Ebola less than a week later. How they were infected is a mystery, officials say.

Ebola’s incubation period is 21 days, and Fauci noted that mark was reached Sunday for Texas Health Presbyterian Hospital workers who first treated Duncan. Duncan was seen at the hospital on Sept. 26 and sent home with antibiotics. He returned by ambulance and was admitted Sept. 28, and died of Ebola Oct. 8.

In a separate development Sunday the Pentagon announced that Defense Secretary Chuck Hagel had ordered the formation of a 30-person support team from across the services to assist civilian medical professionals in the United States if needed to treat Ebola. So far, three cases have been confirmed in this country.

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The team was to be formed by Northern Command’s Commander, General Chuck Jacoby, and was to consist of 20 critical care nurses, five doctors trained in infectious disease, and five trainers in infectious disease protocols.

Once formed, the team would undergo up to a week of specialized training in infection control and personal protective equipment at Fort Sam Houston in San Antonio, then remain in ‘‘prepare to deploy’’ status for 30 days.

The team would not be sent to West Africa or other overseas location, and would ‘‘be called upon domestically only if deemed prudent by our public health professionals,’’ Pentagon press secretary Rear Admiral John Kirby said.

Judge Clay Jenkins, the chief executive of Dallas County, called the 75 health workers who cared for Duncan ‘‘hometown health care heroes,’’ and said they had signed agreements with the state’s public health commissioner to stay off public transportation.

Duncan’s medical records show Pham first encountered Duncan after he was moved to intensive care at 4:40 p.m. on Sept. 29, more than 30 hours after he came to the ER. Nearly 27 hours later, Vinson first appears in Duncan’s charts.

In Pham’s first entry, she makes no mention of protective gear — although doctors and nurses may not always note their own safeguards in medical records, since they are focused on logging the patient’s care.

When she logged in the following morning, she mentioned wearing a double gown, face shield, and protective footwear, equipment she mentioned again in later entries.

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In the first apparent mention of Vinson, she is said to have worn personal protection, including a hazardous-materials suit and face shield. Hospital officials have said masks that cover the nose and mouth were optional, consistent with CDC guidelines at the time.