Five people are in quarantine in Spain as the country focuses its efforts on containing the spread of Ebola.
Another nurse is under observation this morning after one of her colleagues contracted Ebola while treating a priest within a specialised isolation unit. The priest died of the virus.
The husbdand of the first nurse infected with the virus is also under observation. Spanish officials also said they were going to put down a pet dog belonging to the nurse. The regional government said it was worried the dog could carry the disease and pass it on to humans.
It comes as the World Health Organisation says Europe will "almost certainly" see more cases.
Reporter Miguel-Anxo Murado, speaking from Madrid, said the Government there was blaming human error for the contagion.
"For the time being, the authorities are insisting they believe it was human error. They point in particular at the complicated exercise of taking off the protective clothing and say perhaps she made a mistake doing that," he said.
"But of course they still don’t know - this is just speculation (on their part)."
Spokesperson for the World Health Organisation Tarik Jasaraveic said the fight against Ebola needed to focus on its source in West Africa.
"The best way to stop the international spread is to put enough resources to hep those countries who just cannot do it on their own right now," he said.
Lecturer in biomedical and life sciences Derek Gatherer said: "Ebola virus isn’t going to spread as rapidly in Europe as it did in Africa because it thrives in conditions where people are kept in close contact and have very little access to running water, for instance."