He revealed the news in a tweet.

Idris Elba has tested positive for Coronavirus.
The actor told his social media following about the news. He said he's feeling ok, has no symptoms and encouraged people to stay at home.
In a tweet, he said:
"This morning I tested positive for Covid 19."
"I feel ok, I have no symptoms so far but have been isolated since I found out about my possible exposure to the virus."
"Stay home people and be pragmatic. I will keep you updated on how I’m doing".
This morning I tested positive for Covid 19. I feel ok, I have no symptoms so far but have been isolated since I found out about my possible exposure to the virus. Stay home people and be pragmatic. I will keep you updated on how I’m doing ???? No panic. pic.twitter.com/Lg7HVMZglZ
— Idris Elba (@idriselba) March 16, 2020