A prisoner who had been transferred from a jail in Thailand and is being tested for coronavirus has been named as Mark John Rumble.
Thai authorities confirmed the identity of the 31-year-old, who was brought back to the UK on a flight two weeks ago.
He was taken HMP Bullingdon in Oxfordshire, Sky News understands.
Prisoners at the Bicester jail are now being kept in isolation in their cells, with access also restricted to the wing of the complex where they are being held.
The prison has capacity for 1,114 inmates – including those on remand, those who have been sentenced, and young adults aged 18 to 21 – and remains operational, with Public Health England on site helping to manage the situation.
As Rumble and another prisoner was being tested, the World Health Organisation (WHO) announced the illness would now be called COVID-19.
WHO director general Tedros Adhanom Ghebreyesus said the first vaccine could be ready in 18 months “so we have to do everything today using available weapons to fight this virus”.