LONDON (March 4, 2013)--Queen Elizabeth II left a central London hospital Monday after a one-day stay caused by a severe stomach bug.

She walked unassisted out of King Edward VII Hospital Monday afternoon wearing a red dress.

She was driven away in a motorcade.

She was initially expected to spend two days in the hospital for treatment of gastroenteritis, a stomach and intestinal inflammation.

The 86-year-old queen cancelled her engagements for this week because of the illness.

It was her first hospital stay in 10 years.