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Between September 1st, 2002 and August 31st, 2003, a panel of 1,000 stool samples was collected from patients presenting with diarrhea in the three major urban centers of Saudi Arabia; Riyadh, Mecca, and Jeddah. Each sample was tested for rotavirus, and astrovirus by ELISA, G and P type was determined for all rotaviruses. Adenoviruses were sought by hexon‐specific PCR and identified by RFLP. A subset of 253 samples was also tested for norovirus by ELISA. Data were analyzed for seasonality of infection, patient nationality and likelihood of hospitalization. Although the overall incidence of rotavirus identification in acute diarrheal stool continued to decline, this was still the virus identified most commonly (6%). Norovirus accounted for 3.5%, astrovirus, 1.9% and adenovirus, 1.4%. Type G9 rotavirus was found to be present (and already common) in 2003, predating its first reported identification in the country …