Health officials have been made aware of a Welsh person believed to have come into contact with the deadly Ebola virus.
The person visited West Africa where more than 1,600 people have been infected with the virus in recent months, resulting in 887 deaths.
Public Health Wales said the person is "currently staying away from work and limiting contact with other people voluntarily".
A statement from the authority said: " The individual does not have symptoms of Ebola and there are no cases of Ebola in Wales."
The statement added: " We are alert to the possibility of Ebola cases in the UK, given the outbreak in Sierra Leone, Liberia, and Guinea, and we remain vigilant to unexplained illness in people who have travelled from the area.
" Processes have been developed to protect public health in the event that we are notified of any individual who may have been exposed to Ebola."
A spokeswoman said people cannot be tested for the virus before the onset of symptoms. The person is not symptomatic so has not been tested and is being monitored by experts.
The individual has so far been under surveillance for a week and "seems well", she said.
The spokeswoman added that the person will be monitored by experts for 21 days - the maximum period that the virus can incubate before symptoms start.
Ebola is one of the world's deadliest diseases, with up to 90% of cases resulting in death.
The symptoms of Ebola are severe, with patients often overcome by a sudden onset of fever as well as weakness, muscle pain and headaches. Vomiting, diarrhoea, rashes, kidney and liver problems follow as the virus grips the body.
The incubation period - the time between infection and the onset of symptoms - ranges from two days to three weeks. No vaccine or cure is available.