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By Lisa Maria Garza DALLAS Texas (Reuters) - A Texas health worker has contracted Ebola after treating a Liberian who died of the disease in Dallas last week, raising concern about how U.S. medical guidelines aimed at stopping the spread of the disease were breached. Texas Health Presbyterian Hospital in Dallas, where the new case was announced on Sunday, has already faced criticism for its management of the infection. The infected worker, a woman who was not named, is the first person to contract the disease in the United States. She had close and frequent contact during the 11-day treatment of Thomas Eric Duncan, who died on Wednesday, health officials said. The current Ebola outbreak is the worst outbreak on record and has killed more than 4,000 people, mostly in West Africa's Liberia, Sierra Leone and Guinea. Duncan, a Liberian, was exposed to Ebola in his home country and developed the disease while visiting the United States. The new case prompted President Barack Obama to order federal authorities to take additional steps to ensure the American medical system is prepared to follow correct protocols in dealing with Ebola, the White House said on Sunday. There was no word yet how the health worker was infected, but the director of the Centers for Disease Control and Prevention (CDC) said it indicated a professional lapse that may have caused other health workers at the hospital to be infected as well. "We don't know what occurred in the care of the index patient, the original patient, in Dallas, but at some point there was a breach in protocol, and that breach in protocol resulted in this infection," CDC director Dr. Thomas Frieden told a news conference. Hospital officials said the worker had been wearing CDC-recommended protective gear during treatment, including gowns, gloves, masks and shields. "We are evaluating other potential healthcare worker exposures because if this individual was exposed, which they were, it is possible that other individuals were exposed," Frieden said. Tests by the CDC confirmed the patient had been infected with Ebola. Frieden said there was one person who may have had contact with the infected health worker when she could transmit the disease and that person is being monitored. None of the 10 people who had close contact with Duncan or 38 people who had contact with that group have shown any symptoms, state health officials said. The infected worker was not among the 48 being monitored. In a sign of concern over the spread of Ebola, a patient in Massachusetts who recently returned from Liberia and was displaying symptoms of Ebola was transferred from a medical clinic to a Boston hospital on Sunday, the hospital said. The patient has not been confirmed to have the virus. Harvard Vanguard Medical Associates hospital in Braintree, where the patient first went, was closed briefly to deal with the case but reopened, Ben Kruskal, a physician and chief of infectious disease, said in a statement. In the case of Duncan, the Liberian who died in Dallas, the hospital failed to recognize that he might have Ebola when he first went to the emergency room and he was sent home, admitted and diagnosed two days later when his condition was more serious. In an effort to stop the spread of the disease, New York's John F. Kennedy Airport on Saturday began the screening of travelers from the three hardest hit West African countries. The airport is the first of five U.S. airports to start enhanced screening of U.S.-bound travelers from Guinea, Liberia and Sierra Leone. In Liberia, thousands of Liberian healthcare workers are set to begin an indefinite strike at midnight on Monday which could undermine the country's effort to stop the spread of the virus and leave several hundred patients without care. The Ebola virus causes hemorrhagic fever and is spread through direct contact with body fluids from an infected person, who suffers severe bouts of vomiting and diarrhea. The Texas case is not the first outside West Africa in which a health worker contracted the disease after contact with a patient. In Spain, a nurse who contracted Ebola after caring for two infected priests repatriated to Spain remained seriously ill but showed signs of improvement. Teresa Romero, 44, is so far the only person who has tested positive for Ebola through a transmission in the country. EBOLA PAMPHLETS In Dallas, there was a yellow hazardous material drum on the lawn of the brick apartment where the Texas health worker lived and information pamphlets about the Ebola virus were stuffed in the doors in the surrounding blocks of the apartment. Neighbor Cliff Lawson, 57, said he was woken at 6 a.m. by two Dallas police officers who told him "don't panic." "I went back to bed after that. There's nothing you can do about it. You can't wrap your house in bubble wrap," Lawson said. A team was decontaminating the patient's apartment and car. The infected worker, who was taking her temperature twice a day as a precaution, informed the hospital of a fever and was isolated immediately upon arrival there, the hospital said. A union for registered nurses said her case in Dallas showed that not enough is being done to educate health workers on how to manage patients who show signs of infection. “Handing out a piece of paper with a link to the Centers for Disease Control, or telling nurses just to look at the CDC website – as we have heard some hospitals are doing – is not preparedness," said Bonnie Castillo, a registered nurse and senior official with National Nurses United. (Reporting by Jim Forsyth in San Antonio, Frank McGurty in New York, David Bailey in Minneapolis, David Morgan and Valerie Volcovici in Washington and Sarah White in Spain; Writing by Jon Herskovitz and Brendan O'Brien; Editing by Anna Willard, Stephen Powell, Frances Kerry and Lisa Shumaker)