A hospital worker in Texas who treated a patient who died of ebola has tested positive for the disease.
The female nurse had been caring for Thomas Eric Duncan at the Texas Health Presbyterian Hospital in Dallas.Mr Duncan, 42, who had recently arrived from his native Liberia, died in an isolation ward at the hospital last Wednesday, 11 days after being admitted. The unnamed worker, who had been wearing full protective gear, reported having a low-grade fever on Friday and was then isolated, officials said. It is the first known case of ebola being contracted or transmitted in the US. The nurse caught the disease because of a breach of care protocol that could have taken place when Mr Duncan was undergoing dialysis or another medical procedure, said Dr Thomas Frieden, from the Centres for Disease Control (CDC). He said all those who cared for Mr Duncan could potentially be exposed to ebola. Officials were very concerned because the nurse followed full CDC precautions, said Dan Varga, the chief clinical officer for Texas Health Resources. He noted the full protective gear would have included a mask, gown, and gloves. Officials are now monitoring 18 health care workers, according to Dr Varga, and President Barack Obama wants federal authorities to take immediate additional steps to ensure correct protocols are followed. The nurse is believed to be the first person in the US to test positive for ebola who has not been to West Africa, where the outbreak has claimed more than 4,000 lives. Her condition was described as stable but officials said she was going through a great ordeal , adding that she had been considered at low risk of contracting the disease. Mr Duncan was originally sent home from the hospital despite showing symptoms of ebola, and was only re-admitted when his condition deteriorated. His case sparked panic about the possible spread of the virus in the US despite assurances from Mr Obama the chances of that happening were extraordinarily low . The US has begun screening patients entering through John F Kennedy airport in New York. It was the first of five airports to introduce the measures, brought in to give a layer of protection after the death of the first patient diagnosed with ebola on US soil. The four other airports - Newark, Chicago s O Hare, Washington Dulles and Hartsfield-Jackson Atlanta International - are due to begin the checks next week. In Spain, an assistant nurse infected with ebola is showing signs of slight improvement . But Teresa Romero s prognosis remains serious and further complications could not be ruled out, according to the country s government.