“I’ve had a scratchy throat for a couple days but am feeling fine otherwise,” he wrote.

Both he and his wife are vaccinated and boosted, and she has tested negative, he added.

“It’s a reminder to get vaccinated if you haven’t already, even as cases go down.”

Last March all living former U.S. presidents except for Donald Trump appeared in a PSA promoting COVID-19 vaccination, including Obama.

As of Sunday, the world had seen nearly 500 million cases of COVID, with just over 6 million deaths. Nearly 10.7 billion doses of vaccine had been administered, according to the Johns Hopkins Coronavirus Resource Center.