By Sky News US Team
Texas health officials have drawn up a list of about 100 potential or possible contacts of the first ebola patient diagnosed in the US.
However, the Texas Department of State Health Services said it expects the "tracing number will be lower".
Earlier in the day, officials said about 80 people might be exposed to the patient, identified in media reports as Thomas Eric Duncan, or his contacts.
Dallas health officials also ordered four close relatives to stay home and see no visitors.
The move was decided out of an "abundance of caution", the officials said. A violation could result in criminal charges.
Meanwhile in Hawaii, a person is showing possible symptoms of ebola and is undergoing testing in an isolation unit at a Honolulu hospital, officials told the KOHN TV station.
Mr Duncan travelled last month from Liberia, one of the hardest hit countries. He was en route from West Africa to Texas for about 28 hours, flying on three flights and two airlines.
Officials stress there is no risk to fellow travellers because the patient showed no symptoms at the time of his journey.
Mr Duncan left Liberia on 19 September on a flight to Brussels. According to CBS, he flew aboard a Brussels Airlines jet.
After a seven-hour layover, he took United Airlines Flight 951 to Dulles International Airport in Washington, DC.
Then, after another three hours, he boarded Flight 822 to Dallas-Fort Worth, the airline said.
He arrived in Texas on 20 September.
Ebola spreads through contact with bodily fluids such as blood or saliva, which health experts say limits its potential to infect others, unlike airborne diseases.
Still, the long window of time before patients exhibit signs of infection, such as fever, vomiting and diarrhoea, means an infected person can travel without detection.
Previously, officials said they had identified between a dozen and 18 people to be monitored for possible symptoms of the deadly virus.
According to The New York Times, days before departing for the US, Mr Duncan helped transport a pregnant woman suffering from ebola to a hospital in Liberia, where she was turned away for lack of space.
Mr Duncan, who is reported to be in his mid-40s, helped bring the woman back to her family's home and carried her into the house, where she later died, the Times said.
Mr Duncan first went to a Dallas emergency room on 26 September.
But he was sent home with antibiotics even as he informed hospital staff that he was from the epicentre of the African ebola outbreak that has killed thousands of people.
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Gallery: August: Ebola Victims In Isolation
A sick man staggers through a makeshift ebola isolation ward in Liberia. The images released in August illustrate the scale of the difficulties in treating sufferers
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The sick are often left to die in the makeshift wards, sometimes former classrooms
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A woman tries to help her sick husband who trips and falls in one of the wards
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Liberia is struggling to contain the outbreak and the sick face dying in terrible isolation
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The wife of a sick man despairs as her husband lies on the floor after falling
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A child lies sick in an isolation ward in Liberia
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A medical worker with a young family in an isolation ward
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A sick woman lies in a classroom now used as an ebola isolation ward
Two days later, he was seen vomiting on the ground outside an apartment complex as he was bundled into an ambulance, the Reuters news agency reported.
Before being admitted, he came into contact with five schoolchildren. The students had been at school since then but were now under observation at home.
They did not have any symptoms and were low risk, said Dallas Independent School District.
US officials have been stressing they are prepared to deal with an ebola case, and sought to calm fears of a rapid spread.
The current outbreak has infected 6,574 people across five countries and killed 3,091, according to the World Health Organisation.
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