The Queen is spending a second day in hospital where she is being assessed for symptoms of gastroenteritis, SIA reports.
She was taken to London's King Edward VII Hospital from Windsor Castle, where she had been resting, on Sunday. It is her first hospital stay in 10 years.
Buckingham Palace said the Queen, 86, had been admitted as a precaution and was otherwise in "good health".
All official engagements for this week, including the Queen's trip to Rome, will be either cancelled or postponed.
News of her illness first emerged on Friday night and she cancelled a trip to Swansea on Saturday to mark St David's Day in a military ceremony.
However, earlier on Sunday she had carried out a private medal presentation at Windsor Castle.
The Queen is expected to remain in hospital under observation for about two days.
It is not clear whether the visit will be re-scheduled.
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