It was first announced Friday that the queen, 86, was suffering from a stomach illness, The Mirror reported. She is expected to stay at the King Edward VII hospital for two days while doctors treat her for the stomach bug.
Buckingham Palace said all of the queen's engagements this week would be either postponed or canceled.
Gastroenteritis is an infection of the stomach and large intestine that commonly causes patients to vomit, have diarrhea and become dehydrated
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