The Queen has left hospital in central London after being assessed for gastroenteritis symptoms.
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London (CNN) -- Britain's Queen Elizabeth II was hospitalized Sunday after experiencing symptoms of gastroenteritis, a palace spokesman said.
It will be the Queen's first official engagement since leaving hospital earlier this week, where she was treated for gastroenteritis.
Last week the Queen, 86, was admitted to hospital for the first time in 10 years, suffering from the symptoms of gastroenteritis.
The Queen will attend a Commonwealth service and reception on Monday - her first public engagements since she was treated for gastroenteritis.
Gastroenteritis causes an inflammation of the lining of the stomach and intestines.
Gastroenteritis is an inflammation of the lining of the stomach and intestines.
The morbidity and mortality from gastroenteritis has jumped phenomenally in recent years.
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Gastroenteritis is usually caused by a virus and passed person to person, said Dr. Corey Siegel, a gastroenterologist and professor at Dartmouth College's Geisel School of Medicine.
According to the research literature, one study has linked a 1998 outbreak to soda fountains after 99 soldiers in a U.S. Army base were hospitalized with gastroenteritis.
The symptoms of gastroenteritis vomiting and diarrhea usually pass after one or two days, although they can be more severe in older or otherwise vulnerable people.
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Gastroenteritis causes inflammation of the stomach lining and intestines.
In his speech as GAVI host, Gates said he was stunned to hear half a million children a year were being killed by the rotavirus infection, a preventable form of gastroenteritis.
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The 86-year-old monarch was admitted to a London hospital on March 3 with symptoms of gastroenteritis, an inflammation of the lining of the stomach and intestines, before being released the following day.
Buckingham Palace said the 86-year-old queen had experienced symptoms of gastroenteritis and was being examined at London's King Edward VII Hospital the first time in a decade that Elizabeth has been hospitalized.
Britain's National Health Service says that the two most common causes of gastroenteritis in adults are food poisoning and the norovirus, a common winter vomiting bug which typically afflicts between 600, 000 and 1 million Britons each year.
The Centers for Disease Control and Prevention estimates that more than 21 million cases of acute gastroenteritis in the U.S. each year are due to infection with noroviruses, and more than half of all food-borne disease outbreaks can be attributed to them.
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