The world No. 2 confirmed she was self-isolating at home after experiencing mild symptoms from the virus.
The 29-year-old Romanian had decided not to participate at this year’s US Open in August over health concerns amid the pandemic.
The former world No. 1 had been on a 17-game winning streak before her lost to Swiatek at Roland Garros in France.
It was a run that stretched back to January’s Australian Open semifinals and included three WTA titles in Dubai, Prague and Rome.
The two-time grand slam champion won her last major at Wimbledon in 2019.