A government official said Mr Bettel, 48, was suffering from symptoms including coughing, headaches and a slight fever, but had not developed any life-threatening condition.
But he has gone into hospital as his symptoms have not disappeared after testing positive on June 27, the official, who spoke on the condition of anonymity, told AP . “The problem is that the symptoms have not fully disappeared over the past week,” they said.
Mr Bettel’s diagnosis came two days after he attended a European Council summit with other EU leaders in Brussels.
But summit organisers said they were confident that all virus precaution measures had been adhered to during the two-day meeting and no other leader has announced that they have also tested positive.
He was taken in for 24 hours of testing and medical analysis on Sunday and those tests are reportedly still continuing Monday afternoon, the official added.
EU spokeswoman Dana Spinant said: “We understand — and we certainly hope — that it’s not serious, and it’s for checks.”
Well-wishers including the EU Commission President Ursula von der Leyen have taken to social media to wish the Prime Minister a speedy recovery.
She said she wished him “a very speedy recovery,” tweeting: “hope to see you soon in good health. In the meantime, rest and take good care of yourself.”
Bettel has already received one covid vaccine dose and had been scheduled to get his second AstraZeneca shot on July 1.
“It was unfortunate that he tested positive just before that,” the government official said.