The Ebola nurse, Pauline Cafferkey has been under routine monitoring by the Infectious Diseases Unit but is now admitted in the hospital for further investigations.
The 39-year-old from South Lanarkshire is being treated at Glasgow’s Queen Elizabeth University Hospital.
Ms Cafferkey was treated at London’s Royal Free Hospital twice in 2015 after contracting Ebola in Sierra Leone.
The nurse, from Halfway, Cambuslang, had been working as part of the British team at the Kerry Town Ebola treatment centre in 2014.
She had spent almost a month in isolation at the Royal Free at the beginning of 2015 after the virus was detected when she arrived back in the UK.
The nurse was later discharged after apparently making a full recovery, and in March returned to work as a public health nurse at Blantyre Health Centre in South Lanarkshire.
In October, however, it was discovered that Ebola was still present in her body, with health officials later confirming she had been diagnosed with meningitis caused by the virus.
Bodily tissues can harbour the Ebola infection months after the person appears to have fully recovered.
On 9 October, Ms Cafferkey was flown from Glasgow to London in a military aircraft to receive treatment in the isolation unit at the Royal Free Hospital.
Her condition later deteriorated, with the hospital saying she had become “critically ill”, but she began to improve within a few days.
Doctors said Ms Cafferkey had been treated with “a highly experimental” anti-viral drug in the early stages of development called GS5734, but did not know whether it had been of benefit to her.
The Ebola outbreak in West Africa was first reported in March 2014, and rapidly became the deadliest occurrence of the disease since its discovery in 1976.
More than 21 months on from the first confirmed case recorded on 23 March 2014, 11,315 people have been reported as having died from the disease in six countries; Liberia, Guinea, Sierra Leone, Nigeria, the US and Mali.
The total number of reported cases is about 28,637.
On 13 January, 2016, the World Health Organisation declared the last of the countries affected, Liberia, to be Ebola-free.