H1N1 most commonly causes a mild respiratory illness with fever, cough, sore throat, dyspnea, rhinorrhea, myalgias, chills, headache and fatigue. Diarrhea and vomiting are more commonly seen than with seasonal fl u. In a study of patients from April to June 2009 in the USA, gastrointestinal symptoms were seen in 39% patients [29] . Fever and cough are the most common features seen in 93% and 83% respectively [30].