Queen Elizabeth II tested positive for COVID-19 on Sunday and has mild cold-like symptoms, but she intends to keep working.
The queen celebrated her 70th year on the throne on Feb. 6, the anniversary of her father's death in 1952. Her birthday is April 21.
The queen will resume "light" duties at Windsor Castle next week, the palace said.
"She will continue to receive medical attention," the palace said.
Those who test positive for COVID-19 in the UK must self-isolate for five days, though the British government says it will be lifted this week.
Prince Charles, 73, and Camilla, 74, both received COVID-19 earlier this month. Back to work, Charles! Infections among royal staff at Windsor Castle have recently occurred.
Premiers wished you well. Her Majesty's quick COVID recovery and return to vibrant health Everyone wishes the Queen, including Boris Johnson.
"Happy Birthday to Her Majesty The Queen," said Health Secretary Sajid Javid, while Labour Leader Keir Starmer wished her "good health and speedy recovery."
Elizabeth was seen riding a horse in 2020. She's been seen with a cane recently and spent the night in a London hospital in October for tests.
So she missed important events like Remembrance Sunday services and the COP26 climate conference in Glasgow, Scotland, in November.
Just this month, she returned to public duties, holding virtual and in-person audiences with diplomats and politicians.
Last week, she walked slowly with a stick and said, "as you can see, I can't move," referring to her leg.
The COVID-19 diagnosis would worry the royal family, according to Majesty magazine's managing editor Joe Little.
"I would guess she'll be more down to earth about the diagnosis than the people around her," he said.