Spanish nurse Teresa Romero, who became the first person to contract Ebola outside West Africa, has now tested negative for the virus, the Spanish government says.
The result suggests Teresa Romero, 44, is no longer infected – although a second test is required before she can be declared free of Ebola.
Teresa Romero contracted the virus when treating two infected patients in a Madrid hospital earlier this month.
The Ebola outbreak has killed more than 4,500 people across West Africa.
Spanish nurse Teresa Romero became the first person to contract Ebola outside West Africa
Teresa Romero tested positive for the virus on October 6, after she treated two missionaries who had been repatriated from West Africa. The missionaries later died from the virus.
The nurse has said she might have become infected when she removed her protective suit.
A doctor in Madrid said Teresa Romero may have touched her face with her gloves after treating one of the missionaries.
Teresa Romero has been treated at Carlos III hospital in Madrid, and was reportedly given a human serum containing antibodies from Ebola survivors.
A government statement on October 19 said that a blood test appeared to show that the virus was no longer in her body.
She would be given a second test overnight, the statement said, adding that her health was “developing favorably”.
Fifteen other people, including Teresa Romero’s husband, remain under observation in quarantine, but have not shown any symptoms so far, the hospital said.
The incubation period for Ebola can last from two days to three weeks.
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A UN medical worker infected with Ebola has died at St Georg hospital in Leipzig, Germany.
The 56-year-old man, originally from Sudan, died despite receiving experimental drugs to treat the virus, German doctors say.
The Ebola outbreak has killed more than 4,000 people since March – mostly in Liberia, Sierra Leone, Guinea and Nigeria.
The World Health Organization (WHO) says the outbreak is the “the most severe, acute health emergency in modern times”.
The man had been working as a UN medical official in Liberia – one of the worst affected countries – when he caught Ebola.
A UN medical worker infected with Ebola has died at St Georg hospital in Leipzig
He arrived in Germany on October 9 for treatment and was put into a hermetically sealed ward, accessed through airlock systems.
“Despite intensive medical measures and maximum efforts by the medical team, the 56-year-old UN employee succumbed to the serious infectious disease,” a statement from St Georg hospital said.
He was the second member of the UN team in Liberia to die from the virus.
The man was the third Ebola patient to be treated for the deadly virus in Germany after contracting the disease in the outbreak zone in West Africa.
One patient – a Ugandan doctor infected in Sierra Leone – is still receiving treatment in a hospital in Frankfurt, while a Senegalese aid worker was released from a hospital in Hamburg after five weeks of treatment.
The WHO says it is alarmed by the number of health workers who have been exposed to the disease.