“His Royal Highness has no symptoms, but follows all relevant government guidelines and is self-isolating at home,” the spokesperson said.
Kate will not attend Monday’s engagements, the spokesperson added. She was alerted on Friday afternoon and then began to self-isolate.
UK government guidelines state that anyone who has been in close contact with an infected person should self-isolate for 10 days.
A royal source told CNN that the Duchess had passed lateral flow tests before her engagements last week at the Euro 2020 soccer tournament and Wimbledon, and both were negative. She also followed the rules throughout Wimbledon on wearing the mask, the royal source added.
The source said the Duchess is being tested for Covid-19 twice a week with lateral flow testing, according to the Royal Household testing system. She also received both doses of her Covid-19 vaccine, the source added.
Close contact is defined by the UK’s National Health Service as face-to-face communication, or being within two meters (6.5 feet) of a person for more than 15 minutes.
On her trip to Wimbledon on Friday, the Duchess – known as Kate Middleton until her marriage to Prince William – was seated in the Royal Box on Center Court along with a number of other special guests. She was pictured speaking with event planners, attendees and former British tennis number one Tim Henman, among others, and also attended a doubles match on a smaller court.
She also visited the tennis museum at the site. Visitors to the tournament are required to wear a mask except when seated.
On Tuesday, the Duchess was present in England’s 2-0 win over Germany at Euro 2020 at Wembley Stadium, sitting in the royal box with William and Prince George.