Barack Obama has tested positive for a mild case of Covid-19, the former US president said on his Twitter account Sunday.

“I’ve had a scratchy throat for a couple of days, but am feeling fine otherwise,” Obama tweeted, adding that his wife, former first lady Michelle Obama, has so far tested negative.

“Michelle and I are grateful to be vaccinated and boosted,” he wrote.

Obama, plus fellow former presidents Jimmy Carter, George W. Bush, Bill Clinton — and the former first ladies — appeared together in a one-minute video released last March, endorsing the US vaccination campaign and sharing what they missed about pre-pandemic life.

“This vaccine means hope,” Obama said in the video. “It will protect you and those you love from this dangerous and deadly disease.”

In August, Obama scaled back his 60th birthday celebrations due to the spread of the Delta variant of the coronavirus.

Conservative political opponents had lashed out at the former president for planning to host an outdoor party — in which attendees were required to be vaccinated — that had been expected to draw hundreds of guests after Democrats had criticized Donald Trump’s administration for organizing several maskless events at the White House.

Obama reiterated his support for the vaccine in his tweet Sunday, saying his own positive test was “a reminder to get vaccinated if you haven’t already, even as cases go down.”

Despite a vocal anti-vaccination constituency in the country, the US Centers for Disease Control and Prevention (CDC) say more than 80 percent of all people ages five and older in the United States have had at least one Covid-19 vaccine dose.

US daily case counts have fallen off sharply, according to the (CDC), with an average of around 35,000 cases per day in mid-March compared to a peak of an average of 810,000 cases per day in mid-January. (AFP)

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