Sen. Elizabeth Warren, D-Massachusetts, announced Sunday that she had tested positive for COVID-19.

In a statement posted to Twitter, Warren noted that she was only experiencing "mild" symptoms. She also said she had previously been vaccinated and gotten a booster shot.

"As cases increase across the country, I urge everyone who has not already done so to get the vaccine and the booster as soon as possible - together, we can save lives," Warren tweeted.

Warren's positive test comes as COVID-19 cases are on the rise across the country.