Dorries said in a statement that as soon as she was informed of the diagnosis, she took "all the advised precautions", and Public Health England has started tracing her contacts.
She said: "Thanks for so many good wishes".
But she added she was anxious about her 84-year-old mother who was staying with her and began to cough on Tuesday.
LabourList understands that Johnson is not being tested as he has no symptoms, and that he was not in close contact with Dorries despite her attending the reception at No. 10.
Keep safe and keep washing those hands, everyone.
A total of six MPs are now believed to be in self-isolation, including Mr Argar and Ms Dorries. The pair attended an event together this week.
She received her positive test result this evening.
Dion Waiters Officially Signs With The Lakers
However, it's the superstar duo of James and Anthony Davis that has carried the squad to a 47-13 record and top spot in the West. The Lakers also worked out veteran guard JR Smith, who met Monday with Pelinka and Vogel informally after his workout.
The Covid-19 is known to be detrimental on people who have serious chronic medical conditions like heart disease and diabetes and elderly individuals due to their weak immune system.
A number of other politicians around the world have contracted the virus, including at least 24 officials in Iran and one party leader in Italy.
More than 66,000 people have recovered from being infected with the coronavirus.
"We need to take costly, unpopular actions - stopping gatherings, sending children and adults to their homes. Now".
Chancellor Rishi Sunak has pledged the NHS will get "whatever resources it needs" during the crisis, while he is also expected to unveil measures to boost the self-employed and small businesses who are left out of pocket.
Plans to shut down the Houses of Parliament for up to five months have been considered, however, given fears that MPs, who travel regularly from their constituencies to Westminster, could become "super-spreaders" of the virus.