York Central MP Rachael Maskell has urged Prime Minister Boris Johnson to seek advice from the NHS after reports he shared a room with Health Minister Nadine Dorries at an International Women's Day event.
Ms Dorries, the 62-year-old MP for Mid Bedfordshire, attended a Downing Street event on Thursday hosted by the Prime Minister to mark International Women's Day.
But it is understood the PM had no close contact with Ms Dorries at the event, and has no symptoms, meaning he does not need a test.
The Department of Health and Social Care (DHSC) said ministers would not need to undergo testing as Public Health England (PHE) worked to advise those who have been in close contact with Ms Dorries.
PHE said it had assessed the risk of Ms Dorries' individual close contacts and only those with symptoms need to self-isolate.
For each Covid-19 case, a risk assessment is carried out and advice tailored to that group, a spokeswoman said.
Labour MP for York Central Rachael Maskell said she is self-isolating on the advice of 111 following a meeting with the health minister last Thursday.
I'm absolutely fine, obviously it's frustrating because there are things I want to get on with."
It comes after the number of cases in the UK rose to 382, and a sixth death in the UK was confirmed on Tuesday.