A second health worker at a Texas hospital where a man died of ebola has tested positive for the disease.
The unnamed member of staff reported they had a fever on Tuesday and was immediately isolated at Texas Health Presbyterian Hospital.
The health worker is the second person of 77 who treated Liberian Thomas Eric Duncan, who died on 8 October to have caught the disease.
Nina Pham, who is reported to be in stable condition, has been in isolation at the Dallas hospital since Friday.
The nurse has since received a plasma transfusion donated by Dr Kent Brantly, the first American to return to the US from Liberia to be treated for ebola.
The Texas Department of State Health Services said officials were identifying anybody who may have had contact with the newly infected health worker.
In a news conference, Dallas County judge Clay Jenkins said: "At the hospital we have a situation involving 77 people. Two of them have tested positive for ebola. We are preparing contingencies for more and that is a very real possibility.
"You can can imagine the anxieties of those 77 families."
Dallas Fire and rescue have begun decontaminating the apartment building where the health worker lives.
The third case to be reported in the US was identified before world leaders were due to hold a video conference on how to tackle the disease that has killed more than 4,400 people, almost all of them in West Africa.
US President Barack Obama said he planned to pressure some countries into taking firmer action to slow the spread of the disease, which health experts have warned could infect 10,000 people a week within two months.
British, French, German and Italian leaders will be involved in the talks with Mr Obama.
Tom Frieden, US Centers for Disease Control director, has unveiled a series of steps designed to stop the spread of the disease, including the rapid response force to be sent to hospitals where infected are being treated and increased training for healthcare workers.
He made the move after being told by many hospital staff that they lacked the training needed to deal with the virus.
Miss Pham was wearing the CDC-outlined protective gear when she treated Mr Duncan and officials have yet to identify any lapse in procedures, although experts say the mask, shield, gloves and gown can be difficult to put on and remove safely.
Dr Frieden initially blamed an unspecified "breach of protocol" for her infection, but he later apologised after health workers said he appeared to be blaming Miss Pham.
Meanwhile, NBC's chief medical editor has apologised for a breaching voluntary quarantine that she and her team were placed in after cameraman Ashoka Mukpo caught ebola in Liberia.
Dr Nancy Snyderman and two members of her crew were reportedly seen collecting a takeaway order.
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