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Prevalence of sapovirus in diarrheal and nondiarrheal stool samples by age group. Prevalences were based on cross-sectional analysis of sapovirus detected by reverse transcription real-time polymerase chain reaction in 877 diarrheal and 748 nondiarrheal stool samples. Forty-four nondiarrheal samples, which were missing symptom data within 7 days from the sampling date, were excluded.
