STAFF members working at the NHS Louisa Jordan Hospital in Glasgow have tested positive for coronavirus.
Two security employees of firm G4S are self-isolating at home after catching Covid-19.
The company say the two members of staff haven't been on site since their confirmed diagnosis.
A number of other employees who work for the firm are also in quarantine, as a precaution.
A source, who got in touch with the Glasgow Times, raised concerns that an employee who is self-isolating has a family member that lives with them who is currently working on the hospital site.
Read more: NHS Louisa Jordan to remain 'there for as long as we may need it'
But, the Glasgow Times understands that the employee is only self-isolating as a precaution, and does not have any symptoms.
The advice given by the NHS to people who have been told to self-isolate by Test and Protect states that your household does not need to self-isolate if you do not have symptoms.
A spokeswoman for G4S said: "We are extremely proud of our key workers, who have jumped at the opportunity to be part of the national response to the pandemic.
"Safety, infection prevention and control is a key priority to all those working at NHS Louisa Jordan Hospital.
"We continue to follow national guidelines and local controls to protect our teams and those around them, while all our colleagues have received detailed communications on the government's guidance regarding self-isolation."
A spokesman for the temporary hospital, located within the SEC Centre, said they are aware of the news.
He added: "We have had a very small number of positive cases among contracting staff who have been on site - all staff appear to be well and are following all the relevant guidance in relation to self-isolation.
"There are also a small number of individuals who have been isolating as a result of Test and Protect and the Test and Protect App, and again they are following all the relevant self-isolation guidance.
Read more: NHS Louisa Jordan £400k shut-down contract awarded
“NHS Louisa Jordan has been operating continuously throughout the pandemic with additional infection prevention and controls in place to protect the over 300 patients, NHS staff and contractors onsite each day.”
We previously reported that American multi-national engineering firm Aecom, which has a Glasgow base, had been awarded the contract to decommission the £43million NHS hospital.
The Scottish Government said the firm was appointed to manage the closure of the facility "when the time is right" and said the lease of the facility has been extended until April to provide beds for Covid-19 cases if required, as well as outpatient appointments.
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