announced on Twitter that while self-isolating as a close contact, she developed symptoms and subsequently tested positive.
"As a result, I have been unable to train for the last two and a half weeks and sadly, this has put my body in a situation where I am unable to ask it to be fully ready in time for the Olympic Games in Tokyo," wrote Konta, who is ranked 38th.
The opening ceremony is in 10 days.
The Australian-born Konta competed in the Rio de Janeiro Olympics in 2016, saying Tuesday it was "one of my most treasured memories from my career so far."