Queen Elizabeth, 95, has tested positive for COVID and is experiencing mild symptoms, Buckingham Palace said on Sunday.
"The queen has today tested positive for COVID," the Palace said. "Her Majesty is experiencing mild cold like symptoms but expects to continue light duties at Windsor over the coming week.
"She will continue to receive medical attention and will follow all appropriate guidelines."
Charles, 73, the heir to the throne, earlier this month pulled out of an event after contracting coronavirus for a second time. A palace source said he had met the queen just days before.
The health of the queen, the world's oldest and longest-reigning monarch, has been in the spotlight since she spent a night in hospital last October for an unspecified ailment and then was advised by her doctors to rest.
Elizabeth on Wednesday quipped to members of the royal household that she could not move much as she carried out her first in-person engagement since Charles tested positive.
Hijackers being seated next to some of the scores of passengers taken hostage after insurgents took control of a train in southwest Pakistan, has complicating rescue efforts, security sources said on Wednesday.
The captain of a ship, who has been arrested in connection with a crash into a US flagged tanker off the coast of England is a Russian national, the German company which owns the vessel said on Wednesday.
A Russian missile attack on the central Ukrainian city of Kryvyi Rih killed a 47-year-old woman and wounded at least nine other people, Dnipropetrovsk regional governor Serhiy Lysak said on Wednesday.
Yemen's Houthis said on Tuesday they would resume attacks on Israeli ships passing through the Red and Arabian seas, the Bab al-Mandab Strait and the Gulf of Aden, ending a period of relative calm starting in January with the Gaza ceasefire.
US President Donald Trump's increased tariffs on all US steel and aluminum imports took effect on Wednesday, stepping up a campaign to reorder global trade norms in favour of the US that drew swift retaliation from Europe.