Duchess of Cambridge isolates after Covid ping

Kate Middleton attended the Wimbledon tennis tournament last week

The Duchess of Cambridge arrives in the royal box for the Wimbledon Championships last week. AFP

The Duchess of Cambridge has been forced into self-isolation after coming into contact with a positive coronavirus case.

Kensington Palace said on Monday the duchess, who is double vaccinated, would remain at home after receiving the Covid-19 alert.

UK government guidelines state people who have come into contact with a positive case should isolate for 10 days.

"Last week the Duchess of Cambridge came into contact with someone who has subsequently tested positive for Covid-19," the palace said.

"Her Royal Highness is not experiencing any symptoms, but is following all relevant government guidelines and is self-isolating at home."

Kate, wife of Queen Elizabeth II's grandson Prince William, attended a number of events last week, most prominently the Wimbledon tennis championships on Friday.

She met staff at the Lawn Tennis Museum and the Centre Court kitchen. She also sat with former tennis star Tim Henman to watch Jamie Murray play in the doubles.

The royal had been due to attend an event to celebrate the 73rd anniversary of Britain's National Health Service on Monday with William, who is not required to self-isolate.

William himself fell ill with the disease last April, at about the same time as his father, heir-to-the-throne Prince Charles.

The duke did not announce that he had tested positive for the virus until after he recovered. This was to avoid worrying the public at a time when a number of other top officials were ill.

It is expected that William will still attend Monday's events.