The unidentified aide fell ill and tested positive for the virus earlier last week — before the 93-year-old monarch moved from the palace to protect herself, The Sun said.

“The worker tested positive before the Queen left for Windsor [Castle],” a source told the UK paper.

“The Palace has 500 members of staff so, like any workplace, it’s not inconceivable it would be affected in some stage,” the source conceded.

Every member of Royal Household staff that the infected aide came into contact with has been ordered into self-isolation, the paper says. It was not known how close the worker got to the Queen while infected.

The palace told the paper it could not comment “on individual members of staff.”

“In line with the appropriate guidance and our own processes, we have taken the necessary actions to protect all employees and people involved,” a palace spokeswoman told the paper.

It comes amid reports that the Queen is planning to address the nation amid nationwide panic about escalating deaths and infections.

“The voice of Her Majesty will provide calm reassurance that, ultimately, we will get through this,” a source from Prime Minister Boris Johnson’s 10 Downing Street office told The Sun.