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...> Lactose intolerance is usually transient, frequently following a bout of gastroenteritis. ...not warrant testing or disappear spontaneously (for instance, symptoms of gastroenteritis lasting slightly longer than expected, but not causing significant morbidit

...and winter. Infections, such as the [[common cold]], [[influenza]], and [[gastroenteritis]], increase the risk for a relapse.<ref>{{cite journal |author=Confavreux C